Zio Bluetooth CSR 4.0 APTX Transmitter and Receiver 2-in-1 Adapter [Transmit Music to 2 Receivers Simultaneously] for Headphones, smartphone ,TV, Computer / PC, iPod, MP3 / MP4, Car Stereo and More with 3.5 mm Stereo Output (black) Bluetooth-enable all 3.5mm media devices (enable Bluetooth receiving: speakers, headphones and more; enable Bluetooth transmission for: MP3, CD / DVD players, smartphone,TVs and more) With incorporated CSR V4.0 chipset, this wireless audio transmitter & receiver supports support APTX will have low-latency,low BER,low loss,help you enjoy High Quality Audio. You can stream music to TWO Bluetooth-enabled equipment(Bluetooth headphone or Bluetooth Speaker) simultaneously in transmitter mode and connect two Bluetooth device (smartphone or other transmitter )simultaneously in receiver mode.Simple one-button switch to shift between transmitter(T) and receiver(R) mode. Supported Bluetooth profiles: Bluetooth4.0+EDR+APTX,A2DP,SBC, MP3 and AAC; Operation range: 33 ft / 10m Battery life for TX mode: about 15 hours; Battery life for RX mode: about 12 hours.