2A78BHU28-04EHumidifier

NAMES OF PARTS Water Tank Control Panel Atmosphere Indicator Power on/off & Switch Plus Button For Adjusting Minus Button For Adjusting INSTRUCTION MANUAL Humidifier 110mm 100mm100mm100mm100mm 110mm 100mm100mm100mm100mm 100mm 100mm INSTRUCTIONS FOR USECARE & MAINTENANCETROUBLE SHOOTING SPECIFICATIONS Please read this manual carefully before use and keep it properly for future reference. FUNCTION CHARACTERISTICS 1.Power/ Mist Setting Press the middle button once to power on. The device defaults to **large mist mode**, and the water tank indicator turns on. Then, press the **+ ** button or **- ** button to switch mist, with the corresponding indicator turning on. (for large mist mode: all three indicators are on; for medium mist: the left and middle indicators are on; for small mist: only the left indicator is on). 2.Auto humidity setting: Press the middle button again to enter the ** Auto humidity mode**. The auto humidity indicator (a fan icon ) flashes; all indicator are off except for the digital display and the "%" indicator (which stay on). Press the + button or - button to set the humidity (adjustable range: 0 → 40 → 45 → 50 → 55 → 60 → 65 → 70 → 75 → 80), and the humidity set up will be shown on the digital display. The device will exit the setting mode automatically after 5 seconds of inactivity. After setting auto humidity mode, the device switches to **large mist** for operation; if you adjust the mist mode after setting auto humidity, the auto humidity mode will be exited. 3.Timer Thirdly ,press the middle button to enter the **timer mode**. The timer indicator (an alarm clock icon ) flashes; all indicatorsare off except for the digital display and the "H" indicator (which stay on). Press the + button or - button to set the timer duration (adjust- able range: 0 → 2H → 4H → 8H), and the timer duration will be shown on the digital display. The device will exit the setting mode automatically after 5 seconds of inactivity. 4.RGB mode: Press the middle in the fourth time to enter the **RGB mode**. The auto humidity indicator, timer indicator, digital display, and "H’’ , ‘’ %" indicator all stay on. Press the + button or - button to switch RGB colors (options: Gradient, White, Red, Orange, Yellow, Green, Cyan, Blue, Purple; the display shows corresponding codes: 01, 02, 03, 04, 05, 06, 07, 08 respectively). At this point, long press the + button or - button to turn off the Do not add hot water, only suitable for cold water. Please use the original power cord . Always unplug the power cord from electrical outlet before filling. Essential oil should not come in contact with the exterior surface of unit. Do not submerge unit into water to avoid risk of exterior surface of unit. Do not submerge unit into water to avoid risk of electric shock. Do not put fingers, hands, or any object into the unit while operating. Do not attempt to adjust or repair the unit. Do not touch the water while unit is operating. Do not fill water through the Mist Outlet or the Air Outlet. Do not place the unit near heat sources or direct sunlight. Use two hands when moving your humidifier. Please follow the instruction manual to operate the unit. Easy to Clean: Pour the water out of the tank,be careful do not pour water out from the air outlet side. The ceramic disc should not come in contact with any hard or sharp objects. To remove possible buildup, rinse with a white vinegar and water solution. Dry thoroughly with a soft cloth. Do not use strong cleaning agents. Note: Recommend to clean the humidifier once a week. Problem Will not turn on or turn off? Will not put out mist? Possible FactorsSolution Not enough water in the tank. Please add enough water to the tank, not exceeding the 2.8L MAX water line. The power cord connects not properly. Please disconnect the cord, check the cables and reconnect carefully. Not enough water or too much in the tank. Please add enough water to the tank, not exceeding the 2.8L MAX water line. The "Mist Outlet" has dirt. Just clean the "mist outlet" put it in a cool place and wait for it to dry naturally, then it can be used normally. The "Air Intake" port under the base has dirt. Clean the "air intake" with a dry brush. Rated Power Input Voltage Mist Volume Working Time Capacity 24W 250±50ml/h ≥12H 2.8L Timer2H/4H/8H Size195×182×263mm 24V 1A This device complies with Part 18 of the FCC Rules. This equipment has been tested and found to comply with the limits for a Consumer ISM equipment, pursuant to Part 18 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. Please note changes or modifications of this product is not expressly approved by the party responsible for compliance could void the user’ s authority to operate the equipment. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: - Reorient or relocate the receiving antenna. - Increase the separation between the equipment and receiver. - Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. - Consult the dealer or an experienced radio/TV technician for help. Model: HU28-04E FCC ID:2A78BHU28-04E Warning: Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user’ s authority to operate the equipment. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, an…

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Waltek Testing Group (Foshan) Co., Ltd. http://www.waltek.com.cn Reference No.: WTF25F09247985W Page 1 of 4 Picture 1 Picture 2 Waltek Testing Group (Foshan) Co., Ltd. http://www.waltek.com.cn Reference No.: WTF25F09247985W Page 2 of 4 Picture 3 Picture 4 Waltek Testing Group (Foshan) Co., Ltd. http://www.waltek.com.cn Reference No.: WTF25F09247985W Page 3 of 4 Picture 5 Picture 6 Waltek Testing Group (Foshan) Co., Ltd. http://www.waltek.com.cn Reference No.: WTF25F09247985W Page 4 of 4 Picture 7

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Waltek Testing Group (Foshan) Co., Ltd. http://www.waltek.com.cn Reference No.: WTF25F09247985W Page 1 of 10 Picture 1 Picture 2 Waltek Testing Group (Foshan) Co., Ltd. http://www.waltek.com.cn Reference No.: WTF25F09247985W Page 2 of 10 Picture 3 Picture 4 Waltek Testing Group (Foshan) Co., Ltd. http://www.waltek.com.cn Reference No.: WTF25F09247985W Page 3 of 10 Picture 5 Picture 6 Waltek Testing Group (Foshan) Co., Ltd. http://www.waltek.com.cn Reference No.: WTF25F09247985W Page 4 of 10 Picture 7 Picture 8 Waltek Testing Group (Foshan) Co., Ltd. http://www.waltek.com.cn Reference No.: WTF25F09247985W Page 5 of 10 Picture 9 Picture 10 Waltek Testing Group (Foshan) Co., Ltd. http://www.waltek.com.cn Reference No.: WTF25F09247985W Page 6 of 10 Picture 11 Picture 12 Waltek Testing Group (Foshan) Co., Ltd. http://www.waltek.com.cn Reference No.: WTF25F09247985W Page 7 of 10 Picture 13 Picture 14 Waltek Testing Group (Foshan) Co., Ltd. http://www.waltek.com.cn Reference No.: WTF25F09247985W Page 8 of 10 Picture 15 Picture 16 Waltek Testing Group (Foshan) Co., Ltd. http://www.waltek.com.cn Reference No.: WTF25F09247985W Page 9 of 10 Picture 17 Picture 18 Waltek Testing Group (Foshan) Co., Ltd. http://www.waltek.com.cn Reference No.: WTF25F09247985W Page 10 of 10 Picture 19 Picture 20

Waltek Testing Group (Foshan) Co., Ltd. http://www.waltek.com.cn RF Exposure Requirements 1.1 General Information Client Information Applicant ....................................... : GUANGDONG KEGAO ELECTRONICS CO., LTD Address of applicant ................... : No.39 East Science & Technology Ave, Zone A, Shishan Science&Technology Industrial Park, Nan hai District, Foshan City Guangdong Province，china Manufacturer ................................. : The same as above Address of manufacturer ............. : The same as above General Description of E.U.T FCC ID ............................................ : 2A78BHU28-04E Product Name ............................... : Humidifier Model No. ...................................... : HU28-04E Model Description ........................ : --- Rated Voltage ................................ : DC 24V, 1.0A Battery Capacity ........................... : --- Power Adapter .............................. : VS024-2400100VU Input: 100-240V~, 50/60Hz, 0.6A; Output: DC 24.0V, 1.0A Technical Characteristics of EUT Support Standards ....................... : 802.11b, 802.11g, 802.11n Frequency Range ......................... : 2412-2462MHz for 802.11b/g/n(HT20) RF Output Power .......................... : 16.70dBm (Conducted ) Modulation..................................... : 802.11b: DSSS(DBPSK/DQPSK/CCK) 802.11g/n: OFDM (BPSK/QPSK/16QAM/64QAM) Data Rate ....................................... : 1Mbps for 802.11b; 54Mbps for 802.11g; MCS7 for 802.11n Quantity of Channels ................... : 11 for 802.11b/g/n(HT20) Channel Separation ...................... : 5MHz Type of Antenna ........................... : PCB Antenna Antenna Gain ................................ : 2.54dBi (Declared by the manufacturer) Waltek Testing Group (Foshan) Co., Ltd. http://www.waltek.com.cn 2 Applicable Standard According to §1.1307(b)(1) and KDB 447498 D01 General RF Exposure Guidance v06, system operating under the provisions of this section shall be operating in a manner that the public is not exposed to radio frequency energy level in excess limit for maximum permissible exposure. (a) Limits for Occupational / Controlled Exposure Frequency range (MHz) Electric Field Strength (E) (V/m) Magnetic Field Strength (H) (A/m) Power Density (S) (mW/cm 2 ) Averaging Times | E | 2 , | H | 2 or S (minutes) 0.3-3.0 614 1.63 (100)* 6 3.0-30 1842/f 4.89/f (900/f)* 6 30-300 61.4 0.163 1.0 6 300-1500 / / F/300 6 1500-100000 / / 5 6 (b) Limits for General Population / Uncontrolled Exposure Frequency range (MHz) Electric Field Strength (E) (V/m) Magnetic Field Strength (H) (A/m) Power Density (S) (mW/cm 2 ) Averaging Times | E | 2 , | H | 2 or S (minutes) 0.3-1.34 614 1.63 (100)* 30 1.34-30 824/f 2.19/f (180/f)* 30 30-300 27.5 0.073 0.2 30 300-1500 / / F/1500 30 1500-100000 / / 1 30 Note: f = frequency in MHz: * = Plane-wave equivalents power density 3 Calculation Method S = (30*P*G) / (377*R 2 ) S = power density (in appropriate units, e.g., mw/cm 2 ) P = power input to the antenna (in appropriate units, e.g., mw) G = power gain of the antenna in the direction of interest relative to an isotropic radiator, the power gain factor is normally numeric gain. R = distance to the center of radiation of the antenna (in appropriate units, e.g., cm), R=20cm. 4 MPE Calculation Result Frequency (MHz) Antenna Gain (dBi) Numeric gain Conducted Power (dBm) Maximum Tune-up output power PD (mW/cm2) Limit (mW/cm2) (dBm) (mW) 2462 2.54 1.79 16.70 17.00 50.12 0.01789 1.0 Result: Pass ======End of Report======

AntennaSpecification Manufacture：TUYA ProductName：WBR3Antenna AntennaType：PCB TestDate：2021.05.20 Testedby：LongWang Approvedby：Licco Content 1.GeneralDescription.................................................................................1 2.TestConfigurations...................................................................................2 2.1TestEnvironment............................................................................2 2.2TestEquipment...............................................................................2 2.3TestPrinciple...................................................................................2 3.TestResults..............................................................................................3 3.1GainandEfficiency..........................................................................3 3.2RadiationPattern............................................................................4 4.AntennaDimensions................................................................................6 5.EUTPhoto................................................................................................6 6.TestSetupPhoto......................................................................................7 1 1.GeneralDescription ManufacturerHangzhouTuyaInformationTechnologyCo.,Ltd Address Room701,Building3,MoreCenter,No.87GuDunRoad, Hangzhou,Zhejiang,China TestLocation Room106,Building3,LetongSciencePark,No.500, QiuyiRoad,BinjiangDistrict,Hangzhou ProductNameWBR3Antenna Productmodel WBR3 AntennaType PCBAntenna TestItems Gain;Efficiency;RadiationPattern TestFrequency 2400-2500MHz TestStandard ANSI/IEEEStd149-1979 2 2.TestConfigurations 2.1TestEnvironment Temperature(°C)25 Humidity(%RH)60 AtmosphericPressure(kPa)100.5 2.2TestEquipment TestSystemTEM24Multi-probeMicrowaveChamber TestInstrumentAgilentE5071B 2.3TestPrinciple 3 3.TestResults 3.1GainandEfficiency Frequency(MHz)PeakGain(dBi)Efficiency(%) 2400 1.6252.29 2410 1.7152.17 2420 1.9353.14 2430 1.9854.16 2440 2.0057.62 2450 2.1759.64 2460 2.4561.55 2470 2.3860.64 2480 2.5462.86 2490 2.3059.85 2500 2.4960.41 4 3.2RadiationPattern Phi02D Phi902D 5 Theta902D 2480MHz3D 6 4.AntennaDimensions 5.EUTPhoto 7 6.TestSetupPhoto

Waltek Testing Group (Foshan) Co., Ltd. http://www.waltek.com.cn Page 1 of 51 WT-510-201-12-A TEST REPORT Reference No. .................... : WTF25F09247985W FCC ID ................................ : 2A78BHU28-04E Applicant ............................ : GUANGDONG KEGAO ELECTRONICS CO., LTD Address .............................. : No.39 East Science & Technology Ave, Zone A, Shishan Science&Technology Industrial Park, Nan hai District, Foshan City Guangdong Province，china Manufacturer .................... : The same as above Address .............................. : The same as above Product Name .................... : Humidifier Model No. ........................... : HU28-04E Test specification .............. : FCC CFR47 Part 15 Subpart C (Section 15.247) Date of Receipt sample .... : 2025-09-18 Date of Test........................ : 2025-09-19 to 2025-09-22 Date of Issue ...................... : 2025-10-16 Test Report Form No. ....... : WEW-15247A-01B Test Result ......................... Pass Remarks: The results shown in this test report refer only to the sample(s) tested, this test report cannot be reproduced, except in full, without prior written permission of the company. The report would be invalid without specific stamp of test institute and the signatures of approver. Prepared By: Waltek Testing Group (Foshan) Co., Ltd. Address: 1/F., Building 19, Sunlink Machinery City, Xingye 4 Road, Guanglong Industrial Park, Chihua Neighborhood Committee, Chencun, Shunde District, Foshan, Guangdong, China Tel:+86-757-23811398 Fax:+86-757-23811381 E-mail:[email protected] Tested by: Approved by: Kyrie Yun Danny Zhou Reference No.: WTF25F09247985W Page 2 of 51 Waltek Testing Group (Foshan) Co., Ltd. http://www.waltek.com.cn WT-510-201-12-A 1 Revision History Test Report No. Date of Issue Description Status WTF25F09247985W 2025-10-16 Original Valid Reference No.: WTF25F09247985W Page 3 of 51 Waltek Testing Group (Foshan) Co., Ltd. http://www.waltek.com.cn WT-510-201-12-A 2 Contents Page 1 REVISION HISTORY................................................................................................................................. 2 2 CONTENTS ............................................................................................................................................... 3 3 GENERAL INFORMATION ....................................................................................................................... 4 3.1 GENERAL DESCRIPTION OF E.U.T.................................................................................................... 4 3.2 TECHNICAL CHARACTERISTICS OF EUT ........................................................................................... 4 3.3 STANDARDS APPLICABLE FOR TESTING ............................................................................................ 4 3.4 TEST FACILITY ................................................................................................................................ 5 3.5 SUBCONTRACTED ........................................................................................................................... 5 3.6 ABNORMALITIES FROM STANDARD CONDITIONS ................................................................................ 5 4 EUT SETUP AND TEST MODE ................................................................................................................ 6 5 EQUIPMENT USED DURING TEST ......................................................................................................... 7 5.1 EQUIPMENT LIST ............................................................................................................................. 8 5.2 TEST SOFTWARE ............................................................................................................................ 8 5.3 SPECIAL ACCESSORIES AND AUXILIARY EQUIPMENT ......................................................................... 8 5.4 MEASUREMENT UNCERTAINTY ......................................................................................................... 8 6 SUMMARY OF TEST RESULT ................................................................................................................ 9 6.1 ANTENNA REQUIREMENT ............................................................................................................... 10 6.2 RADIATED SPURIOUS EMISSIONS ................................................................................................... 11 6.3 POWER SPECTRAL DENSITY .......................................................................................................... 21 6.4 DTS BANDWIDTH .......................................................................................................................... 25 6.5 RF OUTPUT POWER ...................................................................................................................... 29 6.6 OUT OF BAND EMISSIONS .............................................................................................................. 34 6.7 CONDUCTED EMISSIONS................................................................................................................ 45 7 PHOTOGRAPHS TEST SETUP ............................................................................................................. 49 7.1 PHOTOGRAPHS - RADIATED EMISSION TEST SETUP ........................................................................ 49 7.2 PHOTOGRAPHS – CONDUCTED EMISSION TEST SETUP ................................................................... 50 8 PHOTOGRAPHS – EUT CONSTRUCTIONAL DETAILS ...................................................................... 51 Reference No.: WTF25F09247985W Page 4 of 51 Waltek Testing Group (Foshan) Co., Ltd. http://www.waltek.com.cn WT-510-201-12-A 3 General Information 3.1 General Description of E.U.T Product Name ............................... : Humidifier Model No. .......................…

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Waltek Testing Group (Foshan) Co., Ltd. http://www.waltek.com.cn Reference No.: WTF25F09247985W Page 1 of 2 Test Setup For Radiated Emission (30MHz to 1GHz) Test Setup For Radiated Emission (Above 1GHz) Waltek Testing Group (Foshan) Co., Ltd. http://www.waltek.com.cn Reference No.: WTF25F09247985W Page 2 of 2 Test Setup For Conducted Emission