Bluetooth Chipset: Bluetrum 5632C 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: 30 Hours Type-C charging port 4 Press buttons Matt UVcoating With ANC function , backward feedback ANC depth: 25dB Color: black, white With additional weight With carrying case (optional)
