SPYPOINT Electronic Ear Muffs EEM4-25 Green Adjustable to all head sizes. Allows for high concentration during a shooting situation. Enhances hearing by 10 times Four microphones (two per side). Sound amplification type: Omni-directional mics for a 360 surround sound External microphone with 10ft (3m) cable, attachment clip and windshield. Independent volume control on each side (On/Off) Hearing protection of 24dB. Sound active compression (SAC) to reduce sounds to safe levels ( 85dB) Flexible cushioning easily adapts around the ear. Adjustable padded headband. Power source: 4 x alkaline "N" LR1 batteries (included)