6 Hours of Wireless playback under optimum audio settings. Driver sensitivity at 1kHz/1mW (dB) 102 dB, Dynamic frequency response range (Hz) 20 Hz - 20 kHz, Impedance (ohms) 16 ohmFliphook Technology- Flexible two-way design allows you to wear the headphones either in-ear or behind-the-earIPX5 Sweat..