These pictures let you know exactly how to design the antenna
Bluetooth Mini Projector
Sound can be transmitted wirelessly, no audio source cable is required.
1. The Bluetooth function of the projector can be connected to a Bluetooth speaker, and you can enjoy better sound quality when watching movies and playing music;2. After the projector is connected to the mobile phone through the Bluetooth function, the projector acts as a speaker and can play music from the mobile phone.
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Shenzhen Happybate Trading Co.,LTD , https://www.szhappybateprojector.com