I love this camera! It does everything we wanted it to. Grandpa is in assisted living and we can watch him day and night. We can even talk to him and remind him to stay in bed or tell him that will be late for a visit. Sometimes the sound that I hear on my smartphone is not the greatest quality but what he hears in his room is perfect. I love that we can watch him and I love that the staff know that we can be watching them day or night. One feature that I wish was different is that that app cannot be open with any others on my phone. I've thought about having a separate phone just as the monitor for the camera. It is worth every penny!! I bought my second one just today!!

[UPDATE 1/1/2018: I stand by the fact that technical support is POOR. I had never received a reply back to any of my email inquiries. As such, I downgraded the review from 4 to 3 stars.]

I bought 9 of these, 2 of which did not work properly. This then gave me a glimpse of Yi's customer service -- or lack thereof. I ended up returning the 2 defective ones in frustration.

PROS:
- Great design and build quality
- Apps work great, though they are inconsistent across iOS, Android, and Windows, each with their Pros and Cons
- Ability to share camera feed with family
- Ability to record to microSD cards
- 7 days of 6-second motion alerts saved in the Yi Cloud for free
- Motion alerts work great
- Alert regions can be defined (via a rectangle)
- Can schedule when alerts are on/off
- Video quality is great
- Sound quality is not great, but acceptable
- USB cord is generously long
- Inexpensive
- Easy setup
- Dome allows you to easily pan around. TIP: double-tap on the video to move the camera around
- In California, I have some of the cameras mounted outside under the awning with no problems from the weather
- Manual was easy to follow: how to set up and reset. Does not go beyond that, however
- PIN option available to protect individual cameras from unauthorized access
- Videos are encrypted PRIOR to sending to the Yi Cloud
- Videos are encrypted PRIOR to you using the app to view each camera's Recording
- Windows app allows viewing of cameras in Groupings, letting you live view multiple cameras at the same time

CONS
- Cannot pause video playback
- Only the Windows app allows viewing of cameras in Groupings, letting you live view multiple cameras at the same time. iOS nor Android support that functionality
- No ability to access the cameras outside of the Yi app (such as with a web browser)
- Although setup was easy, voice prompts are loud and can scare people. Furthermore, when doing a firmware upgrade, the voice prompt loudly proclaims that step. Be aware of this if you have babies sleeping nearby
- Cloud plans were a bit confusing, especially when trying to look up how to activate the free, 7-day, 6-second motion alerts (You don't have to do anything. It's automatic)
- Shared cameras cannot have their alerts be independently turned on/off. This means that if I am adding a shared camera to my account, I cannot choose which shared cameras I want to be/not be alerted on
- WIFI cannot be changed through the Yi App. You have to reset the camera
- Removing or adding the microSD card requires a reboot
- Bookmarks do not work well: after a day or so, if you tell the camera to move to the bookmark, it doesn't return to the exact location of the bookmark
- Motion Tracking works, but lags to the point where the person has left the view
- Nightvision behind class is poor unless angled in a certain way because the infrared lights will reflect. This probably is not a limitation I can fault the camera on
- Technical Support is poor. No replies to emails/feedback, nor assistance with the 2 defective cameras. I really wanted to keep them, but was forced to return them due to having received ZERO replies. What's the point of sending out "How do you like our products?" emails, including a "This is our final email to see if there's anything we can help you with", through Amazon if you have NO intention of replying back?
- Dome cannot be panned to look straight up (view is physically hindered by the housing itself)
- Unlike the Kuna app, the Yi app does not show you a snapshot of the live video on the main screen/dashboard. You have to view each camera individually in order to update the thumbnail for that moment. The thumbnails do not refresh when you tell the dashboard/main screen to refresh either
- You have to scroll and scroll to find the camera you want to see (I have over 6 cameras associated with my account, plus several more shared by my parents). It would be nice to have a grid/more compact view available

APPS
iOS Version
- Fast loading
- No iPad version available (it displays a zoomed-in iPhone view instead)
- Timeline navigation was a bit confusing at first: to switch from Live view to Recorded view, you have to tilt the device sideways. It was not immediately apparent
- No ability to view multiple cameras at once

Android version
- Fast loading
- Timeline navigation is a bit more intuitive: there are buttons you can press to switch between Live/Recorded views
- No ability to view multiple cameras at once

Windows version
- VERY fast loading
- Timeline navigation was a bit difficult to initially discover
- Can view multiple cameras at once
- No ability to to change certain settings that the iOS and Android versions allow you to change

With all that said, since I am quite technical, I went ahead and bought 6 more for my extended family. Let's hope that the cameras will last since I'd shutter having to try to contact support. These cameras work very well for the price you pay, and the biggest selling point for me was the ability to record to microSD card without needing to depend on a Cloud subscription. With other vendors, requiring a Cloud subscription can often be detrimental when the Cloud is inaccessible

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I’m in love with this camera. I believe I read somewhere that it wouldn’t work in cold temperatures. Well here in Alaska it recently got 25 below zero degrees Fahrenheit. The camera still functioned properly. I love it. Best security camera. I’ll only buy YI.

I have to say, I am blown away by this camera. For the price, there is no better camera. I paid $50 with a 15% off button, but even at the normal price of $59, this is a steal.
The picture quality (day and night) is excellent and the build quality is outstanding. You can see the specs on this camera in the listing, and it has every function I could want in an indoor security camera (Full HD, IR night vision, pan & tilt, two way audio, motion detection and tracking, etc). The app excellent. It is simple but fully functional and easy to use. This thing does it all and it does it for a fraction of the price of the competitors.
I am planning to buy several more of these for around the house. This is an incredible camera at a budget price. You will not be able to beat this value!

Bought two of these cameras, one to keep an eye on my back deck and patio door and the other to keep an eye on my basement. Although it only supports the 2.4 GHz WiFi band (keep this in mind during setup -- if you set up using a 5GHz connection on your smartphone, it will fail. You need to connect your phone specifically to the 2.4GHz band on your router), the video feed is high quality at about 25KB/sec with about a three second delay. You can zoom up to 8x (digital, not optical) to magnify certain spots.

The live feed allows you to have controlled one-way or two-way conversations through the speaker/microphone. You can wither subscribe to the YI Technologies cloud storage service or you can record and access video/photo feeds from an optional 64GB micro-SD card you insert into the back of the unit.

I was fortunate to read some earlier reviews! NOTE: this unit will not work right out of the box -- unless YI Technologies has updated the firmware on their factory units. Instead, you will need to download the latest firmware from the YI Technologies site to a micro-SD card (usually inserted into an SD card adapter) on your computer, rename the download file per the site's instructions, then pull and insert the micro-SD card into the back of the unit to upgrade the firmware. Once the latest firmware has been installed, the rest of the setup is pretty much plug and play. The firmware process added about 30-45 minutes to the process that otherwise would have taken about five minutes.

In conclusion: great product, very reasonable price. Invest in a 64GB micro-SD card for each unit. Download and install the latest firmware from the YI site, following their instructions. Make sure you set up the unit with your smartphone connected to the 2.4GHz bandwidth if you have a dual bandwidth router (2.4 and 5GHz). Once set up, your router will automatically take care of the 2.4GHz/5GHz translations so you don't need to switch your smartphone every time; this is just a setup requirement that is typical for most/all of these types of devices (including video doorbells) since 2.4GHz maintains a stronger signal over a longer distance from the router than does the 5GHz bandwidth (as of this writing).

The unit can be set on a table or you can use the separate mounting plate to attach the unit to a wall or ceiling. You'll just need to have access to a power source. So, if you have a drop ceiling, you can attach the mounting plate, purchase a long USB-to-micro-USB cable to run to your power source (the unit comes with a 110-volt to USB power adapter) and you can get a full field of vision of your surveillance area.

The smartphone app is excellent and pretty intuitive to use. With it you can add cameras to your suite, switch to different cameras for live view, set up detection rules for each camera, and access any feed history based on the notification rules you set up, including motion detection. If you use a memory card, the history record will overwrite the oldest entries once the card is full.