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，ClassⅡ，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.