Specifications: Model BW-BL3 bluetooth Protocol Support RX: A2DP AVRCP HSP HFP TX: A2DP Transmission Distance 10m Battery Capacity 250mAh Working Hours RX Mode 12 Hours, TX Mode 18 Hours Charging Time Approximately 2 Hours Charging Voltage DC 5V Input/Output Connection Mode 3.5mm stereo audio interface Package Included: 1 * BlitzWolf® bluetooth transmitter receiver 1 * Micro USB Charging Cable 1 * 3.5mm Aux Cable