Features: brand new and high quality Built-in microphone make hands-free phone call noise cancellation provide high clear quality. Broadcast navigation once connected to your for smart device via bluetooth-compatible. Type-c charging recharge battery, constantly for longer using. Receiving technology: This audio receiver uses high-definition lossless receiving technology, so that wireless devices are as clear and fidelity as talking face to face. Wide applicability: This wireless receiver is suitable for home audio, speakers, car stereos, earphones and other equipment. Support equipment: This audio receiver supports wireless V5.0 version, supports stereo, and also supports Wireless hands-free function. Specifications: Version: Bluetooth-compatible V5.0 Frequency range: 2.4GHz-2.480GHz Transmission power: CLASS2 Bluetooth-compatible range: ≦10 meters Bluetooth-compatible protocol: HFP HSP A2DP AVRCP Working voltage: for DC 3.0-4.2 V Working current: ≤19Ma Working time: about 6H Built-in lithium battery: 110mAH Charging voltage: DC+5V Charging time: about 2H Material:ABS Size:Approx.8x5.2x2.9cm/3.14x2.04x1.14inches Color:Black Instructions for use: 1. Connect the device to the home amplifier/car audio/stereo headset with a 3.5mm audio cable; 2. Pair and connect the Bluetooth-compatible device with the mobile phone; 3. After the connection is successful, you can enjoy mobile phone music or hands-free calls through the power amplifier car audio/stereo headset. Package Includes: 1x Receiver note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.