Walkers Ultimate Power Muff features high gain omni-directional microphones and 9x hearing enhancement with 50 dB power. It has AFT with two independent volume controls, sound activated compression, and an NRR of 26dB.The Ultimate Power Muff features a compact, folding design with anti-microbial ear pads. It operates on 2 AAA batteries (included).The Power Muff has two microphones. This item has a black finish.