Silencer Ear Buds from Walker's have integrated omnidirectional microphones and full dynamic range speakers that deliver a crisp clear sound. Along with the advanced technology, Silencer provides a comfort level above and beyond similar products by incorporating GSM's patented SecureLock fitting system. Three different sized contoured fins and foam buds allow for a customized fit. The ear buds offer up to 80 hours of battery life with the four included #10 batteries. Sound activated compression protects hearing. OS-R3110 digital sound processing. Independent volume control. On/off power switch. Removable lanyard. 25 decibel noise reduction rating. Carrying case included.