The Walker's Razor Slim Quad Electronic Earmuffs with Bluetooth feature ultra low profile ear cups for passive support as well as a comfort headband with metal wire frame for variable adjustability. The Walker's Razor Slim Quad Earmuffs is compact in design and offers four hi gain omni directional microphones and the sound dampening composite housing supports and protects up to 23 decibels. Recessed volume control knob is easily accessible and the independent volume control is designed for Bluetooth signals and external mics to control the desired volume of wireless signal separate from ambient sound. Operates on two AAA batteries which are included.