Shell protector with built-in AM/FM stereo receiver. The electronic protection system EPS keeps the receiver volume at a safe level. Manual tuning and automatic frequency control simplify precise tuning of the desired station. Soft sealing cushions with the Smart Snap-In system are easily replaceable. Smooth size adjustment of the headband for optimal comfort. Includes 2 x 1.5 V AA batteries for up to 130 hours. External audio input jack 3.5 mm.