Specifications: Bluetooth Version: 4.1 Transmission Distance: >20M (open area) Working Current: 18-28mA Battery Standard: 300mA Working Time: 8-10 hours Charging Time: 3 hours Output Connections: 3.5mm stereo jack   Package included: 1 X Bluetooth 4.1 Boombox Hifi Multi-function 3.5mm Interface Bluetooth Receiver  1 X USB Charging Cable 1 X 3.5mm Audio Cable 1 X Audio Adapter Cable 1 X Manual