Lightweight and ultra-slim the ISO Tunes Men’s Defy Slim Basic Safety Ear Defenders are a perfect fit for outdoor sports. The comfortable ear defenders are infused with tactical sound control technology to suppress extreme noise levels and enhance the hearing even in loud environments. The defenders offer up to 300 hours of battery life when used with 2 x AAA batteries. These further feature the SafeMax technology which limits the volume output to 85 dB. IPX4 sweat and water resistance ensures that the defenders would aid in hearing under the harshest of weather conditions., Tactical Sound Control / Level Dependency., Up to 300 hours use with 2 x AAA batteries., IPX4 sweat & water resistance., 20 NRR / 27 SNR., SafeMax 85 dBa volume limit.