Wireless effective distance: 10 metres Audio signal to noise ratio: ≥90dB Frequency response: 50Hz - 20KHz Headset battery capacity: 25mAh*2 Charging case battery capacity: 250mAh Music time: Approx. 5 hours (50% volume) Talk time: About 4.5 hours (50% volume) Charging time: About 1.5 hours for headphones and 1.5 hours for storage