Onvis

About the vendor and its products
Onvis Is an example of a company that has "come out of nowhere" to offer smart home products and which made it onto my radar since the products are compatible with HomeKit, which I try to stay up to date about. It is, however, difficult to figure out where the company is from (indications are China) and it seems it might be the type of company that previously undertook manufacturing for other brand names, but now has launched its own products. I would normally recommend some caution toward such companies and their products, but I am partly relieved due to the HomeKit certification and partly by fairly positive test reviews.
Onvis offers (at least per now) three products:
A motion sensor, Smart Motion Sensor SMS1, which also temperature and humidity
Door/window sensor, Security Alarm Contact Sensor, which is a little different than most alternative in that in addition to detecting open/closed status, it also measures temperatur/humidity (which some others also do) as well as has a built-in siren
Smart plug, EU Smart Plug, for EU plugs, with energy monitoring
Air dehumidifier, Smart Dehumidifier, but there is very little detail to be found about this
Indoor security camera, C3 HSV Camera, which supports HomeKit Secure Video
The sensors are based on Bluetooth communication and seem to only have support for Apple HomeKit. There is also an Onvis app.
Our experiences
We have no experiences with products from this vendor.