The Caldwell E-Max Low Profile Electronic Hearing Protection muffs incorporate a load of new technology to amplify voices and range commands while still protecting hearing from loud gunshots, providing users with an enhanced range experience. The Caldwell E-Max Low Profile Electronic Hearing Protection muffs feature dual microphones that amplify noises below 85 decibels, while dampening gunshots to hearing-safe levels. Noise reduction rating: 23 decibels Runs off 2 AAA batteries Low-profile design reduces gun contact while aiming The Caldwell E-Max Low Profile Electronic Hearing Protection muffs also feature an external audio jack, allowing users to plug in Mfg: Caldwell Shooting Supplies