Freon leak detector triggers on R22, R134A, R404a, R410A and all halogenated refrigerants including HFCs, CFCs,HCFCs and blends. 7 Adjustable Sensitivity, our refrigerant leak detector can be automatically adjusted to the best optimum detecting state Response within 3 seconds; Warm up in 6 seconds. Corona Type Leak detector sensor. Powered by: 4 x AAA 1.5 V batteries (batteries not included in the package) Featuring with a corona sensor and advanced leak detect technology, WJL-6000 is our reliable product with the functions of easy operation, stable function and great performance; Its an ideal and economic freon and halogen leak detector. It is widelyapplied on pipe leakage, automobile air conditioner, cold storage, refrigerator repair and so on. Technical Parameters 1.Operating temperature: 0-52 (30 to 125); 2.Maximum sensitivity: 0.21oz/yr,for all halogenated refrigerants; 3.Battery life:approximately 50 hours normal use; 4.Response time:Instantaneous ; 5.operating mode: continuous,no limitation; 6.Fixed probe length:7.87 (in); 7.Dimensions:1.37 x 1.37 x 5.90 in ; 8.Preheating time: approximately 6 seconds; 9.Reset time: two to ten seconds; 10.Power supply: 6V DC, 4 AAA alkaline batteries. 11. Package includes: 1 x Detector,1 x User Manual This includes but is not limited to:CFC, such as R12, R11, R500, R503, etc..Of HCFC, for example, R22, R123, R124, R502, etc. ...of HFC, for example R134a, R404s, R125, etc. ...AZ-50 and the like mixtures thereof. HP62. MP39 etc... Notice: Wait for 6 seconds away from the potential leakage area once the leak detector is switched on for more accurate detection or it may not give right alarm when you try to detect.