Effective wireless range: 10 meters Ratio of audio signal to noise: ≥90dB Response to frequency: 50 Hz to 20 kHz Battery capacity of the headset: 25 mAh * 2 Charging case: 250 mAh About five hours of music at 50% volume About 4.5 hours of talk time at 50% volume It takes roughly one and a half hours to charge headphones and store them.