Full Dynamic Range HD Speakers for Clear Bananced Sound Sound Activated Compression Omnidirectional Microphones 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.table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }