Bluetooth Audio Transmitter for 3.5mm audio devices Used for iPod,MP3,MP4,TV,media players. * Feature Compact size Enable your audio device to transfer stereo audio wirelessly. 3.5mm plug fit for most of audio devices. Rechargeable Lithium-ion battery Compatible seamless with Bluetooth A2DP headset and Bluetooth A2DP speaker etc Specification Bluetooth specification: Bluetooth V2.1/V1.2 Function range: 10 meters Frequency response: 2.4GHz-2.4835GHz Receiving sensitivity: -74±4dB Charging input voltage: DC 5V Working time: Up to 10 hours Charging time: About 2 hours Dimension: 45×32×8mm Weight: 14g What"s in Box * Bluetotoh Audio Transmitter * User Manual * USB Cable