1. Product with small and feashion appearance,easy to use and convenient. 2. Auto match Bluetooth transmitter after power on,no need to code. 3. Three bluetooth audio ports, three people share music at the same time. 4. Build-in audio processing IC provides realistic and accurate reinforcement of the sound. Specifications: Specification : Bluetooth version: 4.0 Effective Emission Range: 5-8 meters Working Current: 500mAh Battery Capacity: 650mAh Power supply : USB interface power DC 5V 3 Bluetooth Audio ports, 3 people share music at the same time Charing Time: 2-3Hours Working Time: 4-5Hours Color: As the picture show Frequency response: 20Hz-20KHz Carrier frequency: 2.4-2.48GHz Devices: Compatible with all Blutooth devices Package Included: 1 x Bluetooth transmitter & receiver 1 x USB charging cable 1 x AV cable 1 x Audio cable 1 x User manual