1、[BT 5.1] 3.5mm BT adapter with 5.1 chip, clear and stable signal transmission, no lag. Built in independent antenna, 15M distance stable transmission, to achieve a wide range of signal coverage. 2、[2 In 1 Design] 3.5mm BT adapter for the transmitter and receiver 2 in 1 design, a key switch. Receive (RX) signal and transmit (TX) signal freely switch, suitable for a variety of devices. 3、[Receive Mode] Provide car connection, so that car speakers into BT speakers in seconds. Plug and play, automatically connect back, enjoy cell phone music and high definition navigation broadcast. 4、[Built in Microphone] This wireless AUX adapter built in microphone, support hands free amplification, clear calls, so that your hands do not have to leave the steering wheel, safer driving. 5、[Ordinary Speaker Upgrade] Use this BT AUX adapter can make your wired devices become wireless, connect ordinary speakers, break the space restrictions, stereo playback, enjoy the shocking sound. 6、[Compatible With Gaming Devices] This 2 in 1 BT receiver transmitter can also connect your for SWITCH, add BT function to it, connect BT headphones, play games anytime, anywhere.