Humidity: 30% ~ 80% Waterproof rate: lp54 Door thickness: 60-100 mm Working voltage: 4.5 V Battery: 3 AAA alkaline batteries (without batteries) Battery life: 10 months (depending on usage) Working environment: Temperature -20 ° C to + 55 ° C Material: aluminum alloy color: black Package Contents: 1 x Home Security Door Lock Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.