Bluetooth Chipset:Jieli AC6955F Function: Bluetooth High quality Speaker Unit:40mm Frequency range:2.402-2.480GHZ 1KHz impedance: 31.6ohm 1KHz sensitivity:112.84dB Sound frequency:20Hz-20KHz Battery: 400Mah/3.7V Wireless Range: 10-15m Charging time: 2 hours Playing Time:25-30 Hours Type-C charging port Press button Matt UV coating Color: black, white With additional weight With carrying case (optional)