PROPRIETARY SOUND TECHNOLOGY: World's only DLSC sound compression technology with 5x hearing amplification to protect your ears while letting you hear softer sounds. Eliminates "tinny" sound INDUSTRY-LEADING METRICS: The Stealth 28 has a Noise Reduction Rating (NRR) of 28 and a lightning fast 2. 0ms response time, which greatly enhances your situational awareness while simultaneously protecting your hearing from loud noise GO ALL DAY WITH RAPID RECHARGE: No more batteries to buy. Just plug in the USB charger and get up to 12 hours of use with a quick three hour charging time ULTRA LIGHTWEIGHT COMFORT: Ultra-lightweight at just 0. 7 ounces and equipped with three sizes of incredibly soft earbuds make all day use a breeze WINDY OUTSIDE? NO PROBLEM: The Stealth 28 was smartly designed with a wind cover over the microphone - reducing the annoying sound that many other ear buds experience on gusty days