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. Mfg: Caldwell Shooting Supplies