Description To Avoide the Risk of Falling Down, We Recommend installation Indoors and It Can Work Perfect as a Rain Sensor Even Though Indoors It Can be Used in Three Scenarios: Rainwater Detection, Water Leak Detection and Flood detection. Water Leak Sensor: Placed under the Sink, Stick or Just Place, the Side of Electrode Face Up IPX7 waterproof Battery model:CR1632 Button Battery Battery capacity: 140mAH Material: Plastic Color: As Shown Package Contents: 1 x Sensor 1 x Double-sided adhesive tape 1 x English Instruction 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.