Product parameters: Product model: Bluetooth audio receiver and transmitter combo Product color: black Bluetooth version: V5.0 Life time: ?4H Bluetooth distance: =10M (open place) Charging method: Micro USB 5V/0.5A Output connection mode: 3.5MM interface Input connection mode: 3.5MM interface Compatible: Android, IOS system mobile phone and PAD, and all Bluetooth audio equipment, audio equipment with audio input interface Accessories: host, charging cable, 3.5 audio head, manual) Battery capacity: 140Amh Suitable type: computer, TV, projector (transmission mode)/speaker, earphone (reception mode)