Walkers Single Mic Electronic Muff is wind resistant, high frequency Mic. 4x hearing enhancement with a 50dB power. Features volume control and is sound activated compression (SAC). Noise reducing rating of NRR 24dB. The power source is 2 Alkaline AAA batteries included. Single wind resistant, high frequency, Mic Noise reducing rating NRR 24dB 4X Hearing enhancement power sound activated compression (SAC) Convenient volume control Powered by 2 Alkaline "AAA" batteries that are included
