Recently, the OTA radio frequency laboratory of Grandsun was built and put into use, which is mainly used for the wireless signal test of the company's wearable devices. OTA (Over The Air) test site, test system and related supporting instruments are used to test the overall radiation performance of mobile communication equipment, while it can test The overall transmitting power and receiving sensitivity of mobile phone, wireless network card, laptop, and other mobile devices. Passive testing can cover antenna gain, efficiency, direction diagram, and other test items. The measurement scheme adopted by the test system is the most accurate antenna test method at present, which has the advantages of high repeatability, high accuracy, and high resolution. The completion and use of the OTA radio frequency laboratory marks that Grandsun has taken a solid step in the field of wearable device manufacturing.