... video doorbell 2. taking picture with SD card 3. two way intercom 4. battery power supply DIY digital peephole door viewer ... , taking picture with SD card, two way intercom Product Functions: The 2nd Generation Peephole Viewer is a ... times)5. Barrel: 14mm~55mm6. Door Thickness: 45mm~90mm7. Accessories: Base Flange, Tightening Tool, Peephole, User Manual, National Warranty ...