Don't miss another conversation again! The amazing Hear-acle Sound Amplifier increases the volume up to 35 decibels for crystal-clear hearing. Smaller than your fingertip, it's nearly invisible. Includes one A10 button cell battery for up to 75 hours of continuous use. Comfortable, lightweight design features adjustable volume control. Comes with a handy carrying case. Plastic. Ear piece is 3/4"L x 1/2"W x 1/2"H.