The E-Max Shadows are Bluetooth, rechargeable electronic ear plugs designed to go where you go, play all your music, and keep your ears protected. High quality stereo sound is Bluetooth compatible with your mobile device and comes with a 23dB noise reduction rating. Dual microphones provide directional clarity and come equipped with easy to use touch volume controls. The charging case comes with an integrated lithium battery.Features Include:23db noise reductionBattery Life: 5 Hours per chargeIncludes a case that can recharge the earplugs 4-5 timesBluetooth Pairing with phones or other capable devices for music or phone callsAdjustable ambient sound amplificationGreat for other noise reduction such as lawnmowers