Features: brand new and high quality Bluetooth-compatible music transmitter is to send audio signals of TV, DVD, MP3 and other playback devices to Bluetooth-compatible receiver, Bluetooth-compatible headset or Bluetooth-compatible speaker, so as to realize wireless home life. No need to install any software and very easy to use. Bluetooth-compatible stereo transmitter does not require batteries. Support A2DP (advanced audio distribution) and arvcp (audio/video remote control). Support paired Bluetooth-compatible stereo headset/headphone to control for play/pause, forward/backward. Specifications: Bluetooth-compatible Version v2.1. Support pairing Pin Code: 123400008888, Frequency Range: 2.42 to 2.480 MHz (analog) spectrum. Support Auto Standby: the stereo bluetooth-compatible headset/headset that starts to rescue in standby mode is not found in for time. Frequency Range: 2.42 to 2.480 MHz (analog) spectrum. Working current: 40mA (maximum). Connector： 30pin Material:ABS Color：Black/ White (Optional) Support Automatic Pairing (no buttons) Size: approx 4x4x8cm/1.57x1.57x3.14in Package Includes: 1 x Bluetooth-compatible Transmitter 1 x English Manual note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.