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 reduction, battery life: 5 Hours per charge, case that can recharge the earplugs 4-5 times, Bluetooth pairing with phones or other capable devices for music or phone calls, adjustable ambient sound amplification, separate left and right channel earplugs- dual microphones for directional clarity, illuminated on/off indicator- auto shut off (4hrs w/o touching controls). Includes multiple size tips for a custom fit and rechargeable storage case.