The Razor Rechargeable ear pro features sound-activated compression, frequency tuned for natural sound clarity, and full dynamic range HD speakers for clear balanced sound. 80 hours of battery life.SPECSLOW NOISE/FREQUENCY TUNED FOR NATURAL SOUND CLARIFY300 MAH RECHARGEABLE LITHIUM BATTERY80 HOURS BATTERY LIFEUSB CHARGING PORTFULL DYNAMIC RANGE HD SPEAKERS FOR CLEAR BALANCED SOUNDSOUND ACTIVATED COMPRESSION 0.02 SECOND REACTION TIME3.5MM AUDIO JACKUSB CHARGING CABLE INCLUDEDSOUND-DAMPENING COMPOSITE RUBBERIZED HOUSINGAVAILABLE IN BLACK OR FLAT DARK EARTHNRR 21DB