Material: ABS+Metal Bluetooth Version/chipset: V5.1/AC6955F Supported protocols: a2dp\avctp\avdtp\avrcp\hfp\spp\smp\att\gap\g att\rfcomm\sdp\l2cap profile Transmission Distance: 10M Working Voltage: 5v Impendance: 32Ω Speaker Power: 2.5mW Charging Time: 3h Calling and Music Play;12H Wireless 5.1, fast and stable signal, low power consumption, longer battery life. 180 days of battery life, up to 12 hours of playback time. CTN G.W: 26.3KG±0.2KG CTN SIZE:46*45.5*72CM