Comfort style and no strings attached! With only one charge you can enjoy up to 16 hours of playing time with great aptX Bluetooth sound quality. We like it practical - just fold them and put them in the included carrying bag since they're extremly lightweight you can easily take them with you anywhere.- Driver size: 40mm- Sound pressure level: 1193dB- Frequency response ( 3dB): 20Hz-20KHz- Impedance: 36- Charging time: 3h- Stand-by time: >2 weeks- Battery: 350 mAh- Wireless range: 10m- Weight: 210g