【2in1 function】 It is a Bluetooth adapter of 2 in 1 transmitter (transmitter) and receiver (receiver). One of both the sending and receiving devices applies to the mode that the bluetooth function has. Switch between transmitter (TX) mode and receiver (RX) mode with one switch. How to use: In TX transmission mode, long press of the on button for 6 seconds, the blue light flashes quickly, it can be played with Bluetooth compatible speakers, headphones, etc. In RX reception mode, switch the RX mode, long press the On button for 6 seconds, the red and blue light alternately flashes, you can pair with "BT - B9" of the Bluetooth compatible audio source and enjoy the music wirelessly I will. • Since [Bluetooth 2.1 + EDR] adopts the CSR chip, it not only codecs the functions of AAC and APTX, but the pairing function is even stronger than Bluetooth 4.1, power saving is realized, Bluetooth connection The range also became wider. If there are no obstacles, you can reach up to 10 meters and you can enjoy your favorite music wirelessly. • [2 simultaneous transmitter] Enter the sound of a device (such as a TV, speaker etc.) that does not support wireless transmission and send it to your existing Bluetooth compatible equipment (such as a wireless earphone), and two Bluetooth equipments You can connect at the same time. Smooth transmitter with low latency and no stress, it can play correctly cleanly. I can enjoy life as if there is no remembrance. • [Convenient function] When turning on the button every time, it automatically connects with the device that became pairing at the front. It is more convenient than the product of another company. By adopting a long-lasting lithium-ion battery, if you charge for over 2 hours, it can be used continuously for 8 to 10 hours or more. You can use it while charging. • Applicable models Applies to models with bluetooth function and 3.5 mm audio output jack. Iphone, Android smartphone, Bluetooth headphones, tablet, PC, TV, stereo, car stereo and so on.