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Packing Size :27*20*8cmInstructionThis product is widely used in single family. Such as villas, hotels, one family in high buildings,office and ect.Fix the doorbell on the wall or door with screws or double-side adhesive, Signal strength will be showed in the indoor unit. Freely using it in any place that has stable wifi signal. Wireless unlock control connection is simple; easy to use, and do video intercom; unlock the e-locks with a touch. http://www.doorbellalarm.com/
