The Walker's Razor Rechargeable Electronic ear muffs are ready for the range when you are. The rechargeable muffs have an estimated 80 hours of battery life to get through several days of training or range outings. The Comfort Headband holds the muffs in place during rigorous training and allows you to wear the muffs during long range sessions in comfort. Made of a durable sound dampening composite housing, the Razor Rechargeable Muffs provide a noise reduction rating of 23 NRR. The sound activated compression is 0.002 seconds to ensure your hearing is protected. The two speakers pick up ambient noise and broadcast it through HD speakers for ultra clear sound. There is an audio jack to connect to your electronics as well. The low-profile ear cups are ideal when shooting longs guns because they are less likely to interfere with the stock. An over-the-ear muff is preferable for indoor ranges as well. Protecting your hearing is very important so Walker's makes protecting your hearing easy.