Descriptions:?2-In-1 Bridges Your Bluetooth Device To Your Speakers Or Your Bluetooth Speakers To Your Audio Device.?Simple one-button switch to shift between transmitter(TX) and receiver(RX) mode. ?TX Mode:Plug In To Your Non-Bluetooth Device And Pair Up Your Bluetooth Speaker Or Headset.?RX Mode: Plug Into Your Non-Bluetooth Speaker And Pair Up Your Bluetooth Phone Or MP3 Player.?Bluetooth-enable all 3.5mm media devices (enable Bluetooth receiving: speakers、 headphones and more; enable Bluetooth transmission for: MP3、 CD / DVD players、 e-readers、 TVs and more).?Built in battery for portable use、 or fast-charging it through the USB cable、 BUT、 it can not be used while charging!?Ideal For Any Powered Speakers Or Devices Using Standard RCA Or 3.5mm Jack Or AD2P Bluetooth.1↔? Take the output of your CD/DVD players、 MP3/MP4 players、 PDAs、 or iPod and convert it to streaming stereo audio via Bluetooth transmission - all in one compact unit. 2)worked as a bluetooth transmitter to make your audio device have bluetooth function 3) worked as a bluetooth receiver、 add bluetooth receiving funciton to your headphones、 home stereo、 Hi-Fi system4↔?Transmitter & Receiver All in One↔?Just change the mode to enjoy your simply life.Specifications:Bluetooth: V3.0↔?Class↓?↔?Supports Bluetooth A2DP and AVRCP profile with 3.5mm stereo plug.Transmission Distance: 10m / 33ftWorking frequency range: 2.402Ghz-2.480GhzWorking Time: TX: up to 8 Hours RX: up to 6 HoursBattery: 160mAH Lithium batteryCharging Time: 2 HoursSwitchable Mode: RX/TXCharging Requirement:5V DC、100~240V AC adapterWorking Temperature:Material: ABSDimension: 6.6* 2.5 * 0.9cm Audio Port: 3.5mmColor: BlackNet Weight: 15gPackage includes:1 * 2 in 1 Bluetooth audio Transmitter & Receiver1 * 3.5mm Stereo Audio Cable1 * Charge Cable1* User's guide.