Bluetooth receiver Bluetooth transmitter TF card playback FM radio hands-free calling navigation music player memory function multi-function buttons Selling point one: 4 in 1 Support Bluetooth reception (RX) and Bluetooth transmission (TX) FM transmission TF card playback 4 in 1 function. Selling point two: USB power supply: USB power supply no need to worry about battery problems. The Bluetooth receiver is small in size light in weight easy to carry and has a built-in 300mAh battery which can continuously listen to music for about 6 hours. Easy to operate' Selling point three: high-definition LED digital screen all working conditions are clear at a glance. Suitable for cars without auxiliary interfaces FM connection Selling point 4: Widely used in speakers TVs projectors cars computers laptops power amplifiers etc. Selling point five: Visual screen: You can search and display nearby Bluetooth devices at the same time free to choose.