Advanced hybrid multi-microphone technology provides improved noise reduction - a 23% of ambient sounds. | AV30s are extremely light and comfortable. Three different sets of ear domes -- small, medium and large -- are included, so you can find the perfect match for your ears. | The AV30's rechargeable battery lasts more than 4 hours in noise cancelling mode. And the carrycase includes a built-in battery-operated charger that can recharge the AV30s four times before the case needs recharging | A fully-depleted battery typically recharges in 1.5 -2 hours. A partially-depleted battery will take less time to recharge.
| Bluetooth connectivity is typically good for 30 feet or more