Freon leak detector triggers on R22, R134A, R404a, R410A and all halogenated refrigerants including HFCs, CFCs,HCFCs and blends. Response within 3 seconds; in 6 seconds. 7 Adjustable Sensitivity; Maximum sensitivity is 0.21oz/yr. Audible and visual gas leakage indicators and dual battery indicator. A flexible probe around 7.9-inch allows detections in difficult and hard-to-reach areas. Power Supply: 4XAAA battery (not included) Colour:Photo Color Material:ABS Size:about 23 x 6.5 x 6.5cm Package Contents: 1 x Freon leak detector 1 x English manual Only 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.