1:sensors:CMOS with mihara digital image sensor
2:zoom:3 times digital zoom
3.doorbell: doorbell function and there are 32 ring tongs for choose
4.MicroCD card slot: supports up to 32 GB
5.infrared: 4 IR LED with night version, LED turns on auto-matically when it back light.
6.power: 3pcs AA batteries
7.date and time: if you chooes this function, the photo and video will show this.
8.the low vplatage: when the voltage is low, the power icon will blink with the sound drip, dtip...
9.the hole diameter: 14-35 mm
10.door thickness: 35-100 mm
11.product size: 147*83*19 mm