Parrott P41TR Voice Recognition Headset with Microphone Perfect headset when accuracy and clarity are a must, and is adjustable for right or left ear. Microphone and headset cord is 10 feet In-line Amplifier for amplification of microphone gain and adjustable microphone gain Microphone an headset plugs are 3.5 mm (2) AA Alkaline batteries (not included) will last approximately 1 year