Freon leak detectors trigger on R22, R134A, R404a, R410A and all halogenated refrigerants (including CFCs, HCFCs and mixtures). Audible and visual gas leak indicator with dual battery indicator. Reacts to all halogenated refrigerants. This includes but is not limited to: After rotating the switch, the detector is ready for use. 1-7 level selectable sensitivity Response time: 3 seconds Working temperature: 0-52C (32-125F) Highest sensitivity to halogenated refrigerants: 0.21 oz/yr Battery life: approximately 50 hours of normal use Operation mode: continuous and unlimited Fixed probe length: 7.87 inches Dimensions: 1.37 x 1.37 x 5.90 inches Warm-up time: approximately 6 seconds Reset time: 2 to 10 seconds Power supply: 6V DC, 4 AAA alkaline batteries (not included) The Freon tester includes UV lamp and white flashlight. The UV lamp is used with fluorescent dye, and the white light is suitable for illuminating dark and confined areas. (LED light requires battery) Color: Black + Yellow Material: ABS Package Contents: 1 x Halogen leak detector Only the above package content; other items are not included Note: Light reflection and different displays may cause slight color variations between the image and the actual item. Measurement error allowed is +/- 1-3 cm.