Features: Connect the Bluetooth Stereo Audio Transmitter to the Audio Devices (Such as Mp3， Mp4， TV and PC， etc) without Bluetooth function via 3.5mm the included audio plug， changing these audio devices into Bluetooth-enabled audio devices， and making it is able to work with Bluetooth-enabled Headset and Speaker. With 3.5mm audio plug， fit for most kinds of audio devices， such as CD Player， TV， MP3， MP4， PC， etc. The Bluetooth Stereo Audio Transmitter changes the audio devices without Bluetooth function into Bluetooth-enabled audio devices， and transmits the audio signal to Bluetooth-enabled device wirelessly.Plug and play， no need installation. Built-in high-performance rechargeable lithium battery， can offer 5~7 hours of work time after fully charged (Charged via USB Cable). Compact size， portable and lightweight. Specifications: Color: WhiteBluetooth version: Bluetooth 2.1+EDR Bluetooth profiles: A2DP / AVRCP Bluetooth Frequency Range: 2.4GHz~2.4835GHz Effective Transmitter Range: up to 10m Receiving Sensitivity: -74 ±4dBInput voltage: DC 5V Charge time: Approx. 2 hours Work time: Approx. 5~7 hours Material: ABS Item size: Approx. 4.5 * 3.5 * 0.8cm / 1.8 * 1.4 * 0.3in Item weight: Approx. 15g / 0.5oz Package size: 11 * 7.5 * 2cm / 4.3 * 3 * 0.8in Package weight: Approx. 40g / 1.4oz Package List: 1 * Bluetooth Audio Transmitter 1 * USB Charge Cable 1 * User Manual (English)