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Note: please tap "?" in the APP to study the user manual. Features: -An alarm need two AAA alkaline batteries ( included ). -It can work for at least a year with low-consumption design. -Not only an alarm, but also a doorbell. -Package Size: 11*8*2.5cm -Package Weight: 67g Easily installtion: There is double-sided adhesive on the Alarm and Magnet box, just peel and stick to doors, windows or anywhere. Note: 1 The 2 parts need be aligned by their alignment arrow. 2 The Distance between them should be less than 10mm. Package: 1* Alarm, 1* Magnet box, 1* User Manual