2753-5350 Features: -AM/FM radio with superior sound quality.-Inner-ventilated headband is cool and comfortable with quick, click height adjustment.-Automatic shut off after four hours to preserve battery life.-Toggle switch to change between AM and FM. Includes: -Includes 2 AA batteries with one hundred hours of batter life and easy battery replacement. Specifications: -Radio volume does not exceed 82dB.-Noise reduction rating NRR 23 when the radio is in off position.