1With high quality sound and stable transmission without lag to make you enjoy high quality music from your smart phone or tablet. 2Can not be turned off when charging and will keep always on for reconnection next usage. So you do not need turn on each time. 3Connect 2 bluetooth devices at the same time, conveniently switch to another device, and perfect for handsfree calling when driving. 4Wireless receiver and transmitter in 1 with big button design and easy to control, automatic repairing for a hasslefree experience. 5Compatible with most smart devices for wide compatibility. Stream and control your music with a reliable connection from up to 10m/33ft. 6With builtin HD microphone, and the 3.5mm audio connector can be plugged into a 3.5mm/2.5mm 2RCA port. Item Type: BluetoothAdapter Material: ABS Bluetooth Version: 5.0 Frequency Range:2.4GHz Output Power Category: Class 2 Bluetooth Mode: HFP/HSP/A2DP/AVRCP Bluetooth Range: Approx. up to 33ft/10.1m Battery Type: Button Battery(Built-in) Battery Model: CR-2025 Battery:250mAh Working Current: 16-30mA Charge Voltage: DC 5.0V Charge Current: 160mA How to Use: 1. Connect with vehicles or other electronic products by connecting wire. 2. Can be used after booting. 1 x Bluetooth Adapter 1 x USB Cable 1 x Connection Cable 1 x Audio Cable 1 x Manual