Freon leak detectors trigger on R22, R134A, R404a, R410A all halogenated refrigerants (including , , HCFC mixtures). Audible visual gas leak indicator dual battery indicator. Will react to all halogenation. This includes but is not limited to: After rotating the switch, the detector is ready for use. 1-7 level selectable sensitivity Response time: 3s Working temperature: 0-52 (30 to 125) The highest sensitivity to all halogenated refrigerants: 0.21oz/yr Battery life: about 50 hours of normal use Operation mode: continuous unlimited Fixed probe length: 7.87 (in) Dimensions: 1.37 x 1.37 x 5.90 inches Warm-up time: about 6 seconds Reset time: two to ten seconds Power supply: 6V DC, 4 AAA alkaline batteries. (not include) The Freon tester comes with UV lamp and white flashlight. UV lamp is used with fluorescent agent, white light is suitable for illuminating dark small places.(LED light contains battery) Colour: BlackandYellow Material: ABS Package Contents: 1 x Halogen leak detector Only the above package content, other products are not included. Note: Light reflection different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.