Freon leak detectors trigger on R22, R134A, R404a, R410A and all halogenated refrigerants (including HFC, CFC, HCFC and mixtures).Audible and visual gas leak indicator and 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 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)Colour: BlackMaterial: PlasticPackage Contents:1 x detectorOnly the above package content, other products are not included.Note: Light 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.