JBL Tune770nc Wireless Over Ear 40mm Headphones, ANC, Bluetooth, 1Y - Purple Driver sensitivity: at 1kHz/1mW 97dB Dynamic frequency response range: 20Hz to 20kHz Impedance: 32Ohms Charging Cable Length: 0.2m Charging time: 2hrs Maximum music play time with ANC off: 70hrs Maximum play time: 35hrs Features: Built-in Microphone; Ambient Aware; JBL Pure Bass Sound; Hands Free Call; Multi-Point Connection; Supports Speed Charge; Adaptive Noise Cancelling; Foldable Design Warranty: 1 Year Official Warranty