Freon leak detectors trigger on R22, R134A, R404a, R410A and all halogenated refrigerants (including , , HCFC and mixtures).Audible and visual gas leak indicator and dual battery indicator.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 sensitivityResponse time: 3sWorking temperature: 0-52 (30 to 125)The highest sensitivity to all halogenated refrigerants: 0.21oz/yrBattery life: about 50 hours of normal useOperation mode: continuous and unlimitedFixed probe length: 7.87 (in)Dimensions: 1.37 x 1.37 x 5.90 inchesWarm-up time: about 6 secondsReset time: two to ten secondsPower supply: 6V DC, 4 AAA alkaline batteries. (not include)The Freon tester comes with UV lamp + white flashlight. UV lamp is used with fluorescent agent, white light is suitable for illuminating dark and small places.(LED light contains battery)Colour: Black+YellowMaterial: ABSPackage Contents:1 x Halogen leak detectorOnly the above package content, other products are not included.Note: Light reflection and 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.