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. Includes selectable sensitivity levels 1-7. Response time: 3 seconds. Working temperature: 0℃-52℃ (30℉ to 125℉). Highest sensitivity to all halogenated refrigerants: 0.21 oz/yr. Battery life: approximately 50 hours under 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 leak detector includes a 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. No other items included. Note: Lighting effects and different displays may cause slight color variations between the image and the actual item. Measurement error allowance: +/- 1-3 cm.