Features:1. Bluetooth V2.1 + EDR makes for added data transfer rate and reduced latency in sound transmission、 ensuring optimal audio quality well suited for watching TV/movies 2. Transforms any device (e.g. TV、 computer、 MP3 player、 PSP) with 3.5mm audio-out jack into a Bluetooth-capable music streaming solution with no additional drivers required3. Charging and working in parallel (with no static noise) is supported4. Supports A2DP、 enabling your audio device to transfer stereo audio wirelessly5. Embedded Li-ion battery allows for convenient recharging6. Energy saving capability: powers off automatically if pairing fails for over 5 minutesSpecifications:Bluetooth version: Bluetooth V2.1+EDRBluetooth profile: A2DP and AVRCPFrequency response: 2.4GHZ-2.4835GHZReceiving sensitivity: -74¡À4dBEffective range : Up to 10mCharging input voltage:  DC 5VBuilt in rechargeable batteryWorking time:  Up to 10 hoursCharging time:  About 2 hoursDimensions: 3.5 x 4.7 x 0.8 cm / 1.38 x 1.85 x 0.31 inches>> You'll Get:1 x Bluetooth Audio Transmitter1 x USB Charging Cable1 x User Manual