Sliding scale filter selection Backlit multi-function LCD display showing ... Noise level graphically and digitally Dynamic sensitivity (signal strength) Settings and operation mode Levels of leak noise can be recorded for comparison in a histogram profile (MLP) IP65 enclosure Aviation-quality headphones with volume control Lightweight, easily portable system Membrane keypad Versatile - ground microphone and hand probe configurations Military specification connectors Robust construction for field use Rechargeable batteries (up to 25 hours use)