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Item: Intelligent Welcome door bell with 433mhz wireless doorbells,wireless digital doorbell (KR-M7) Wireless Doorbell Technical Parameter: 1. Split style, main alarm can be put in table and PIR sensor be installed in ceiling of door 2. 4 optional working mode: Welcome alarm, doorbell, alarm system, night-light 3. USB power plug, Power save technology 4. Can be as emergency alarm 5. Size: Alarm part: 115*63*29mm PIR sensor: 89*69*30mm 6. Working temperature: -10C-50C 7. Adapter DC: 110V~220V to 9-12V 8. Wireless Receive Distance: 100m (open area), 30m (within one barrier9. Wireless Frequency: 433MHzPackage Content 1 x Wireless Transmitter (PIR Motion Sensor) 1 x Wireless Receiver