Linkage with other smart devicesNo battery replacement required for 1 yearsUsed directly without toolsMoisture approvedmanufacturing processFaster feedback speedSpecifications:Zigbee /Hub: RequiredOperating voltage: 2.3-3.3VDetection accuracy:Less than 5mmBattery model:3V CR2032Life of battery: 1 YearsWorking temperature:-10--45 CelsiusRelative humidity: 0-95%(Non-condensing)Detection distance: 10-30m indoors, 30-50m outdoors (only as reference)App: Tuya Smart/Smart Life: Tuya Colour:WhiteMaterial:ABSSize:5 x 2.5 x 1.1cmPackage Contents:1 * Smart Contact DetectorsOnly 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.