Intercom System - Helmet HeadsetCaracteristicas: High Fidelity Stereo Sound for Smart Phone or other Music Source VOX (Voice Activation) Separate Front Inputs for Music & SmartPhone Audio Output 2 Front Headphone Inputs (Front of Unit) 2 Rear Headphone Inputs (Back of Unit) RF Shield Housing High level output for headphones for sound quality Dimension: 1. 6 H x 4. 5 W x 4. 3 D NH100 Off Road helmet headphones Noise Cancelling Smart Mic High Fidelity Bass Enhanced Speakers (Stereo)