Sony Wireless Stereo Headset with Mic Noise-Canceling MDR-EX31BN

Type: Closed dynamic type Driver unit: Approx. 13.5 mm Mass: Approx. 34g Power source: Lithium-ion rechargeable battery (built-in) Charging time: Approximately 2.5 hours Type: Electret condenser type Directional characteristics: omnidirectional Noise canceling function available Battery life (continuous audio playback time): (NC ON) up to 9.0 hours, (NC OFF) up to 10.5 hours Battery life (continuous talk time): (NC ON) up to 6.5 hours, (NC OFF) up to 7.5 hours Battery life (standby time): (NC ON) up to 30 hours, (NC OFF) up to 100 hours Included accessories: Hybrid earpieces S, M, L (2 each), micro USB cable