The Bluetooth Stereo Audio Transmitter is Specially designed for the Audio Devices (Such as Mp3， Mp4， TV and PC， etc) without Bluetooth function. You can connect the Bluetooth Stereo Audio Transmitter to the audio devices with Bluetooth function via the included 3.5mm Audio Plug， changing these audio devices into Bluetooth-enabled audio devices， and making it work with Bluetooth-enabled Headset and Speaker. With the Bluetooth Stereo Audio Transmitter， you can greatly enjoy the music of the Audio Devices (Such as Mp3， Mp4， TV and PC， etc) without Bluetooth function by the Bluetooth-enabled Speaker and Headset.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: Black Material: ABS  Bluetooth version: Bluetooth 4.0 + EDR Bluetooth profiles: A2DP HSP HFP OPP OBEX DUNBluetooth Frequency Range: 2.4GHz~2.4835GHz Effective Transmitter Range: up to 8 ~ 15m Receiving Sensitivity: -74 ±4dBHigh-performance Built-in 250mA Rechargeable Lithium Battery Input voltage: DC 5V Working Voltage: 3.3～4.2VWorking Current: 150mAMaximum Working Current: 30mACharge time: Approx. 2 hours Work time: Approx. 8~10 hours Standby Time: About 720 hoursItem size: Approx. 5.8 * 3.5 * 1.5cm / 2.28 * 1.37 * 0.59in Item weight: Approx. 22g / 0.78oz Package size: 11 * 7.5 * 2cm / 4.3 * 3 * 0.8in Package weight: Approx. 52g / 1.85oz   Package List: 1 * Bluetooth Audio Transmitter 1 * 3.5mm Audio Cable1 * USB Charge Cable