Technology: Wireless 4.0 technology ensures transmitting strong signal in high quality and high speed. Transmission distance is up to 10m / 33ft, free to enjoy wireless music. BT Audio Transmitter: Can be connected to the audio devices (such as MP3, MP4, TV and PC, etc.) without Bluetooth function, changing them into BT-enabled ones, and making it work with BT-enabled Headset and Speaker. Powered By USB: with USB plug, you can plug and play this transmitter easily and no need any other driver software, powered by USB, there is also no time limited. Perfect Sound Effect: Adopts Advanced Bluetooth Module which lets it get high-quality sound effect with A2DP. You can enjoy music, watch movies and play games without disturbing others. Mini and Portable: Delicate and high-end glossy appearance design, mini and light-weight, very easy to carry and custody. Specifications: Bluetooth Version: 4.0 Transmission Distance: up to 10m (no obstacle) Main Item Size: 6.6 * 2.7 * 0.9cm / 2.59 * 1.06 * 0.35in Main Item Weight: 12g / 0.39oz Package includes: 1 x Bluetooth Transmitter 1 x 3.5mm Audio Cable 1 x RCA Cable 1 x User Manual