Item Type: Audio Receiver Transmitter Adapter Model: B5 Material: ABS Colour: Black Battery Type: Built-In 250mAh Lithium Battery BT Version: V5.0 Audio Performance: SBC BT Distance: >10m/32.8ft Charging Method: USB 5V/0.5A Charging Current: 5V DC 500mA Charging Time: 2h Endurance: RX (Receiving Mode)>12h, TX (Transmitting Mode)>8h RX (Receiving Mode): A2DP, AVRCP, HFP TX (Transmission Mode): A2DP Scope of Application: BT Devices, Such As Andd and IOS Phones and Tablets, and Audio Devices with Audio Input Package List 1 x BT Receiver Transmitter 1 x Audio Cable 1 x Data Line 1 x Manual 1It can be connected to non BT car audio system through 3.5mm AUX adapter; equipped with BT 5.0 chip, stable connection, fast transmission speed, wide signal range, and paired with mobile phones. 2Built in 250mA battery. The working time of this BT adapter is up to 12 hours when calling or playing music (as a BT receiver). The car receiver will automatically reconnect to the last paired BT device as long as they are within wireless range. 3It only takes 2 hours for the BT adapter to use the fast charging cable to fully charge the device. In addition, this BT music adapter can be used while charging, which is very convenient. 4Built in microphone and a middle button to answer/redial/hang up/reject a call, you can talk hands free. And it supports broadcasting voice notifications from existing navigation applications. 52 1 in design, you can send and receive all audio freely and easily. The transmitter enables your audio source device to transmit music to your BT headset or speaker; RX mode allows non BT devices to wirelessly transmit music from your phone/PC.