Audio Components Product characteristics: CSRA64215Bluetooth master, Bluetooth version 4.2, supporting AAC, aptx, aptx ll, and connecting two mobile phones at the same time It starts with the car and uses it when it is powered on. It supports safe driving when receiving and making calls Support voice control (Apple Siri, Android voice), long press 1 second multi-function button to start voice control All metal body, strong anti-interference, no common ground noise, no need to add additional common ground isolator Built in over-voltage PTC protection to protect your car Two lines (0.6m and 1.2m)(gold plating) Convenient for different customer needs Multi-function key description lnot connectedstateshort press - enter pairing mode, long press 3 seconds to disconnect and enter pairing mode, long press 7 seconds to clear Bluetooth record lConnected state: short presstoplay orpause, long press for 1 second to release voice control, long press for 3 seconds to disconnect connected devices and enter pairing mode, long press for 7 seconds to ClearBluetooth record lIncoming Call state: short press to answer or hang up, long press to reject lMusic playing state: Double click to select the next song,le Click to select the previous song Parameter description Product model: A108 Bluetooth Name: BluetoothA108 Size: 38 * 38 * 10.5mm (38mm circle) Power supply voltage: 5V 500mA Bluetooth version: v4.2 Bluetooth protocol: A2DP v1.3/AVRCP v1.6/HFP v1.6 Inventory Packing box Bluetooth receiver USB ; 3.5 two in one cable Instructions