Freon leak detectors trigger on R22, R134A, R404a, R410A and all halogenated refrigerants (including , , HCFC and mixtures).Audible and visual leak indicator and dual battery indicator.Will react to all halogenation. This includes is not limited to:After rotating the switch, the detector is 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 Fixed 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.