2AIRP-858951SKY Rover KING

Alpha Group Co., Ltd. Date: 19 April, 2021 To: Federal Communications Commission, Authorization & Evaluation Division, 7435 Oakland Mills Road, Columbia, MD 21046 RE: Alpha Group Co., Ltd. FCC ID: 2AIRP-858951 FCC Certification Confidentiality Request Gentlemen: This letter is to comply with 47 CFR 0.457 and 0.459 pertaining to confidentiality material. Alpha Group Co., Ltd. requests that the following documents regarding this submission for FCC ID : 2AIRP- 858951 be kept Long-Term confidential: Exhibit Type File Name Block Diagram Block Diagram.pdf Schematics Schematics.pdf Operational Description Operational Description.pdf And below exhibit kept short-term confidential (180 days): Exhibit Type File Name External Photos External Photo.pdf Internal Photos Internal Photo.pdf Test Setup Photos Test Setup Photos.pdf Users Manuals Users Manual.pdf Those documents contain detailed system and equipment description and related information about the product which Alpha Group Co., Ltd. considers to be confidential proprietary, a custom design and, otherwise, not releasable to the general public. Since this design is a basis form which future technological products will evolve, Alpha Group Co., Ltd. considers this information would be of benefit to its competitors, and that the disclosure of the information in these documents would give competitors an unfair advantage in the market. Thank you for your attention to this matter. Yours Sincerely, Print name: xinyue xu Title: Manager Alpha Group Co., Ltd.

Annex No.: BL-SZ2140204-AW 1 / 4 EUT EXTERNAL PHOTOS FRONT VIEW OF EUT b REAR VIEW OF EUT Annex No.: BL-SZ2140204-AW 2 / 4 LEFT SIDE VIEW OF EUT RIGHT SIDE OF EUT X Annex No.: BL-SZ2140204-AW 3 / 4 TOP VIEW OF EUT c BOTTOM VIEW OF EUT Annex No.: BL-SZ2140204-AW 4 / 4 Accessory-Remote-controlled helicopter Accessory-Power Line

Annex No.: BL-SZ2140204-AI 1 / 9 EUT INTERNAL PHOTOS EUT UNCOVER VIEW EUT UNCOVER VIEW Annex No.: BL-SZ2140204-AI 2 / 9 EUT UNCOVER VIEW EUT UNCOVER VIEW Annex No.: BL-SZ2140204-AI 3 / 9 MAIN BOARD TOP VIEW MAIN BOARD REAR VIEW Dipole Antenna RF Chip Annex No.: BL-SZ2140204-AI 4 / 9 SECONDARY BOARD 1 TOP VIEW SECONDARY BOARD 1 REAR VIEW Annex No.: BL-SZ2140204-AI 5 / 9 SECONDARY BOARD 2 TOP VIEW SECONDARY BOARD 2 REAR VIEW Annex No.: BL-SZ2140204-AI 6 / 9 Battery Remote-controlled helicopter: EUT UNCOVER VIEW Annex No.: BL-SZ2140204-AI 7 / 9 EUT UNCOVER VIEW MAIN BOARD TOP VIEW Annex No.: BL-SZ2140204-AI 8 / 9 MAIN BOARD REAR VIEW SECONDARY BOARD 1 TOP VIEW Annex No.: BL-SZ2140204-AI 9 / 9 SECONDARY BOARD 1 REAR VIEW Battery

Report No.: BL-SZ2140204-601 2 / 29 Revision History Version Issue Date Revisions Content Rev. 01 Apr. 21, 2021 Initial Issue TABLE OF CONTENTS 1 ADMINISTRATIVE DATA (GENERAL INFORMATION) .......................................................................... 4 1.1 Identification of the Testing Laboratory .............................................................................................. 4 1.2 Identification of the Responsible Testing Location ............................................................................. 4 1.3 Laboratory Condition .......................................................................................................................... 4 1.4 Announce ........................................................................................................................................... 4 2 PRODUCT INFORMATION ...................................................................................................................... 5 2.1 Applicant Information ......................................................................................................................... 5 2.2 Manufacturer Information ................................................................................................................... 5 2.3 Factory Information ............................................................................................................................ 5 2.4 General Description for Equipment under Test (EUT) ....................................................................... 5 2.5 Technical Information ......................................................................................................................... 6 2.6 Additional Instructions ........................................................................................................................ 7 3 SUMMARY OF TEST RESULTS .............................................................................................................. 8 3.1 Test Standards ................................................................................................................................... 8 3.2 Verdict ................................................................................................................................................ 8 4 GENERAL TEST CONFIGURATIONS ..................................................................................................... 9 4.1 Test Environments ............................................................................................................................. 9 4.2 Test Equipment List ........................................................................................................................... 9 4.3 Measurement Uncertainty ................................................................................................................ 10 4.4 Description of Test Setup ................................................................................................................. 11 4.4.1 For Antenna Port Test ............................................................................................................... 11 4.4.2 For AC Power Supply Port Test ................................................................................................ 11 4.4.3 For Radiated Test (Below 30 MHz) ........................................................................................... 12 4.4.4 For Radiated Test (30 MHz-1 GHz) .......................................................................................... 12 4.4.5 For Radiated Test (Above 1 GHz) ............................................................................................. 13 5 TEST ITEMS ........................................................................................................................................... 14 Report No.: BL-SZ2140204-601 3 / 29 5.1 Antenna Requirements .................................................................................................................... 14 5.1.1 Relevant Standards ................................................................................................................... 14 5.1.2 Antenna Anti-Replacement Construction .................................................................................. 14 5.1.3 Antenna Gain ............................................................................................................................ 14 5.2 20 dB and 99% Bandwidth ............................................................................................................... 15 5.2.1 Limit ........................................................................................................................................... 15 5.2.2 Test Setups ............................................................................................................................... 15 5.2.3 Test Procedure .......................................................................................................................... 15 5.2.4 Test Result ................................................................................................................................ 15 5.3 AC Conducted Emission .................................................................................................................. 16 5.3.1 Limit ........................................................................................................................................... 16 5.3.2 Test Setups ............................................................................................................................... 16 5.3.3 Test Procedure .......................................................................................................................... 16 5.3.4 Test Result ................................................................................................................................ 16 5.4 Radiated Spurious Emissi…

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Annex No.: BL-SZ2140204-AR 1 / 3 TEST SETUP PHOTOS 1 Radiated Test Photo Below 30MHz 30MHz-1GHz Annex No.: BL-SZ2140204-AR 2 / 3 Close-up Above 1GHz Annex No.: BL-SZ2140204-AR 3 / 3 Close-up 2 Conducted Test Photo Conducted Test