Features This 2-in-1 bluetooth transmitter 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 connect to a USB power source for always-on application. Ideal For Any Powered Speakers Or Devices Using Standard RCA Or 3.5mm Jack Or AD2P Bluetooth. Specifications Bluetooth specification: V3. 0Bluetooth profiles: A2DP and AVRCPOperating distance: Up to 30 feetsWorking time: TX Mode: Up to 8 hoursRX Mode: Up to 6 hoursCharging time: About 2 hoursDimensions: 5.1 * 2.7 * 1. 1cmWeight: 11.6g Package including: 1 * 2-In-1 Bluetooth Receiver/Transmitter1 * Micro USB charger cable1 * 3.5mm Audio cable1 * User Manual