Safeguards your ears from harmful noise, while heightening your senses and ability to react.Level dependent function in stereo that lets you hear ambient sound: conversation, machine sounds and warning signalsLast setting is stored when switched offAutomatic shut-off after two hours if no function is usedBattery life is about 1000 hours. Warning signal when power is low, before shut-offAudio input jack for external radioGuide-mounted microphoneHelmet Mounted Style with FLEX connector