Features: brand new and high quality Bluetooth-compatible5.0 audio receiver adapter, handsfree in car audio phone call receiving. Automatically connect back to the paired Bluetooth-compatible device when powered on Built-in 150mAh rechargeable battery, environmental for protection and energy saving. Five minutes without device connection, automatic shutdown Wireless receiver adapter with microphone for stereo music Specifications: Bluetooth-compatible version: BT5.0+EDR Battery: Built-in 150mA Support : Stereo Music Bluetooth-compatible Playback Sistance :within 10 Meters/33ft Size: approx Mixed Material: ABS Transmition Rate: 24（Mbps） Connection: AUX 3.5mm Color: Black Package Includes: 1PC x Audio Receiver 1PC x User Manual note: There might be a bit color distortions due to different computer resolutions. There might be size errors due to different computer resolutions.