Whether at home or on the go The wi-c310 headphones deliver great sound with up to 15 hours of battery life1 A versatile and practical design with 9mm driver units for clear sound and lightweight design for maximum comfort make these a great choice for wireless headphones. Frequency Response (Bluetooth Communication): 20 Hz–20,000 Hz (44.1 kHz Sampling), Magnet: Neodymium, Frequency Range: 2.4 GHz band (2.4000 GHz–2.4835 GHz)