About this item Replacment Earpiece for 3M PELTOR TEP-100 Tactical Earplug Intuitive one-button operation turns unit on and off and selects high or normal volume setting Lithium-Ion battery provides up to 16 hours of continuous operation between charges Portable charging case powered by 3 AA alkaline batteries or USB (Micro B) port 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) Tactical earplugs and portable charging station (with cover and USB ports closed) are IP67 compliant and water resistant (immersion of up to 1 meter for 30 minutes)