The Razor Rechargeable features sound activated compression, frequency tuned for natural sound clarity and full dynamic range HD speakers for clear, balanced sound. Includes a 3.5mm audio input jack, sound dampening housing, and USB charging port. Full dynamic range HD speakers provide clear, balanced sound Low noise/frequency tuned for natural sound clarity Sound activated compression Sound dampening composite housing 40 hours of battery life - USB rechargeable Length: 0.00000000000000000000 Width: 0.00000000000000000000 Height: 0.00000000000000000000 Colour: Black