Air sucking System for faster response and higer sensitivity Microprocessor Control with advanced digital signal processing. Semiconductor gas sensor. High / Mid / Low Leak Sensitivity Selector R-22, 134a Hi : 3g/year , Mid : 15g/year , Lo : 30g/year R-404A, 407C, 410A Hi : 4g/year , Mid : 20g/year , Lo : 40g/year 7 LED Tri-colored Visual Leak Level Indicator Ambient Concentration Reset Warm-up Time: 45 seconds Snake Tube Length: 400mm (15.5) flexible stainless probe Auto power Off: 10 minutes Ambient Concentration reset. Equal Sensitivity to CFCs, HCFCs and HFCs. Low battery indication. Reference Leak source included. Hard Carrying case included.