【Transmitter+Receiver 2 in 1】In TX mode: connect it to non-Bluetooth devices such as TV/PC/MP3/CD/DVD player/projector to transmit audio to Bluetooth headphones/speakers. In RX mode: connect it to car speakers/home theater/wired speakers/headphones to receive audio signals from smartphones/tablets/laptops via Bluetooth connection. Multifunctional interface: Bluetooth adapter for speakers supports RCA / 3.5 mm jack/TF card slot and a USB drive port for playing music. It is compatible with 99% of speakers, old AV receivers, car stereos and home stereos. You can enjoy the music atmosphere anytime and anywhere. (Only works in RX mode, TF card is not included in the box).