Is it worth installing smart peepholes? I used the doorbell for two years and added a peephole, just for the screen in the room

Last month, my mom came over for a while. When the courier knocked on the door, her first reaction was to take out her phone, flip through her reading glasses, and look for the Mijia app, wanting to see who was outside. After crossing the three thresholds, the courier had already placed the boxes on the ground. The video doorbell at home had been used for two years , and for the first time, I realized it wasn't direct enough for elders like my mom's gaze. I ordered a smart peephole and installed it. After a month, let's talk about whether the money was worth it.

peephole and doorbell are two different things; installing them in the wrong place is a waste of money

first separate these two brothers. The doorbell is the receiver outside the door; its main function is to wait for someone to press it: someone presses the button, it records a segment, pushes it to the phone, and the main part is passive, etc. The peephole is different; it replaces the traditional peephole on the door, with the camera facing outward and installed inside the hole. At the other end of the room is a screen, so you can watch whenever you want—it's active observation.

three hard differences to think carefully before buying:

200 yuan difference, I bought the screen, the stable home unit, and the big battery. When I was selecting equipment for the door, I wrote an article how to choose a doorbell . That article was detailed, but Maoyan only mentioned one sentence, so I'll make up for it here.

the screen in the room is the soul of the peephole

A

5-inch 720P screen, hung 1.4 meters high inside the door. My mom could tell if anyone was outside just by passing by, without reading glasses—the person on the screen was noticeably bigger than on the phone, so she could see the face clearly. My child is in first grade, standing on tiptoe and unable to reach the traditional peephole. Before, when someone knocked, he could only move a chair, but now he can see him standing on the ground and looking up.

speak with frequency. During the two years when the doorbell was up, I opened the app once or twice a day, and I usually only checked when notified by notifications. After installing the peephole this month, the whole family has to look at that screen five or six times a day: before leaving, check if packages are left at the door; if there's movement in the middle of the night, glance down the hallway; when guests arrive, first check who it is before deciding whether to open the door. The doorbell automatically lights up the screen when pressed—guests press the button, and the screen lights up by itself, so no one inside the room needs to move.

night vision is truly useful. Our hallway uses voice-activated lights. Even when the lights go out in the second half of the night, the screen still shows images. Infrared night vision is a black-and-white image, and recognizing faces is enough. This is similar to choosing surveillance cameras. In scenes like the entrance, night vision is a fundamental skill, not a bonus.

Measure two numbers before placing an order: aperture and door thickness

peephole is installed in the door hole, so if the quantity is not accurate, return shipping costs yourself. Two numbers: the diameter of the peephole-shaped hole on the door and the thickness of the door. The mainstream security door aperture ranges from 15 to 22 millimeters, commonly with 16, 18, and 22 millimeters; Doors generally cover 35 to 105 millimeters in thickness. If you don't have a caliper at home, take off an old peephole and measure a one-yuan coin. The coin has a diameter of 25 millimeters, so you can see how much difference there is. If the error is one or two millimeters, you can figure it out.

my old 2009 security door, with a hole diameter of 22mm and a bit over 6cm thick, it's the most standard size. I removed the old peephole and reinstalled it all at once. Here's a little trick for removing old peepholes: the indoor end is reversed, pinch and twist it back to come off, don't twist it outside the door—the tighter it gets.

there are two types of doors to watch out for. One type has very small holes; some new process door holes are only 15 to 16 millimeters, and some models cannot fit the fitting rings, so you need to first ask customer service for a gasket solution; The other type is especially thick doors, with steel-wood doors about 8 to 9 centimeters upward. The length of the fixing screws must be correct. Usually, the package includes three pairs of screws of different lengths, chosen according to the thickness of the door. Before placing an order, report these two quantities to customer service—a one-minute matter saves you the hassle of returning goods.

the battery life is calculated based on how often you "look"

claim range is not just for the sake of it. My 8000mAh battery is officially said to last almost half a year in long-endurance mode, but that mode is power-saving logic: no one is still moving, passively waiting for someone to trigger it. I enabled dwell detection and real-time viewing, set screen brightness to medium, and actually charged once a month. The screen consumes a lot of power; the more frequently it lights up and the more real-time images you can view, the faster it will fall.

luckily, the main unit is inside the house, so charging is easy: unplug the other end of the screen, use the charger to charge inside, the Type-C port takes two hours to full, plug it back in and keep using it, no need to dig off the outside unit like a doorbell to leave a gap. The app will notify you when the battery drops to 20%. Don't drag it out until it's completely dead—the lithium battery will be depleted and will harm its lifespan. Low temperatures in winter are unfriendly to lithium batteries. I clearly remember the previous lesson when the doorbell froze and drained the battery at the door. The peephole battery is located indoors, naturally avoiding this pit.

really cares about range, there's a trade-off: lower detection sensitivity by one level and only target people within three meters, ignoring those far away, so it can last for several more days. The price is that someone stands a bit farther away from your door, so it doesn't make a sound, and it weighs its own judgment.

Before

installation, take a look at the direction of the door—this has been ruled by the court

this is more important than the parameters. In 2025, there was a Beijing case where a resident installed a video doorbell claiming it was to prevent thieves from collecting evidence, but the court still ruled for tort and demolition, arguing that the device could capture neighbors' travel patterns and was not used as a shield for defense. Chongqing has a similar ruling, where equipment at the entrance caught the elevator entering and exiting the opposite door, so it was removed. An earlier case in Haidian was where the electronic peephole directly facing the neighbor's door was also ordered to be demolished.

in terms of operation, there are only three things. Try to narrow the camera angle downward; just one or two meters in front of your own door is enough; don't frame the opposite door or the elevator entrance in the frame; Before pretending, you greet the neighbor; most conflicts only start after the setup is done; Just save the video locally and loop overwrite it; don't use the cloud to store long-term images of your neighbors. privacy self-check of home cameras I wrote about it, and the logic of the door device is the same: if the camera points into the public hallway, it's not just your private matter.

who rings the doorbell, who deserves the peephole

not everyone needs a peephole. For rented houses without peepholes, if you don't want to drill holes, sticking doorbell adhesive is the easiest way; If there are elderly people living alone, elderly people living together, or poor eyesight, the peephole screen is worth the price difference; For a girl living alone, the screen inside the door is 1.4 meters high, so you don't have to lean close to the door to check the hole—the sense of security is genuine.

my recommended order is: first measure the aperture and door thickness, then check the orientation of the door for privacy mines, and finally stand at the door to measure the signal—devices like the peephole smart locks. My actual test at the door was -72dBm, which is connected but not spacious. When installing the network, just stand by the door and it's done in one go. The network only recognizes 2.4G. The dual-band integration at home is first removed. This pitfall is in the robot vacuum network article was very detailed, covering all doorstep devices.

As for my mom, she now lives back at her own home, and she calls every day urging me to replace the one at her doorstep too. Setting her up the network, binding my account, and watching remotely—this process is the same as I helped her manage the router remotely: I manage the devices, she watches the screen herself, and she knows who's knocking with just a glance.