Shenzhen Defengyuan Technology Co., LTD which is a professional bluetooth keyboard, selfie stick, bluetooth anti-lost alarm and self-timer manufacturer.We have our own R&D team and factory. And we also accept OEM and ODM order. Our bluetooth anti-lost alarm mainly use the standard USA broadcom bluetooth 4.0 solutions. So the quality is stable. 80% trading company of Shenzhen buy the keyboard from us and then export the meyboards to all over the world. We always get 100% good feedback from our clients.