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Specifications: Type: magic eye Material: Zinc Alloy Type: Digital Doorbell LCD screen: 3.5 inch Touch Screen Sensor: 2 Mega CMOS Sensor Function: Energy saving, Low Power Alert Power supply: 4pcs AAA batteries (not included) Door Hole Range: 14-28mm Door Thickness Range: 35-100mm Keyword: digital door viewer Power source: 4pcs AAA batteries door hole diameter: 14-28 mm Door Thickness: 35-100 mm Indoor device size: 120x62x20 mm Diameter (camera outdoors): 30 mm Net weight: 197g Package includes: 1 x Outdoor Unit 1 x Indoor Unit 3 x Pairs of Screw 1 x Metal bracket