ShenZhen Ktlink Digital Technology Co.,LTD. the main products are mini bluetooth module, mini Bluetooth headset, stereo Bluetooth headset, FM bluetooth headset, MP3 bluetooth headset, handsfree bluetooth headset,mobile headset, bluetooth carkit, usb dongle, Mini Bluetooth Dongle, audio bluetooth dongle, bluetooth walkie-talkie, bluetooth interphone, bluetooth telephone, bluetooth meeting system, bluetooth advertisement sending system, 10meter, 50meter, 100meter, 200meter, 300meter module are available 1000meter bluetooth , etc .