Helps provide hearing protection in environments with hazardous noise. External microphones help you hear communication and environmental sounds. Intuitive 1-button operation powers earpiece on/off and selects volume level. Rechargeable lithium-ion battery, charging cable included, along with weather-resistant earpieces and charging case. Small and lightweight design. Choice of replaceable communications eartips designed to fit most ear canal sizes: UltraFit™ Communication Tip (23dB), Triple C Communication Tip (27dB), and Skull Screw Communication Tip (30dB). Compatible with most headborne Personal Protective Equipment such as helmets, hardhats, eyewear and faceshields. Tested in accordance with ANSI S3.19-1974.