Amplifies sound from 90 feet away lightweight and flexible device is suitable for both the right and left ear features adjustable volume control Rechargeable Plastic, 2''L x 1''W x 1''H. Amplifies sound from 90 feet away This personal hearing amplifier fits comfortably and discreetly over your ear and helps you hear every word loud and clear. The lightweight and flexible device is suitable for both the right and left ear and features adjustable volume control (up to 50 decibels), as well as a high/low frequency switch. You'll never have to buy batteries again! Plastic, 2''L x 1''W x 1''H.