Professional earmuffs HRXS220A PELTOR WorkTunes provide protection against potentially hazardous noise in the workplace while allowing uninterrupted listening to FM radio; flexible and easy control thanks to the integrated antenna; 3.5 mm stereo connector for connecting external devices; automatic power-off after 4 hours of non-use saves energy. Voice menu: - Volume (8 levels) - Channel search (up to 5 channels) - Channel memory (up to 5 channels) - Radio frequency • Operating time approx. 40 hours • Automatic shutdown • 2 x AA batteries