FIBARO HK Door/Window Sensor FGBHDW-002-1 Apple Homekit

Power supply: 3.6V DC battery
Operating temperature: 0-40?C (32-104?F)
Temperature measuring range: 0-40?C (32-104?F)
Temperature measuring accuracy: ?0.5?C (?0.9?F)
Dimensions (L x W x H): 71 x 18 x 18 mm (2.8 x 0.7 x 0.7 inch)