I was impressed by the design and small size, so I decided to get 2. One for the router and one for an access control keyboard. Both of them lost their autonomy very quickly, so I decided to open one to see what battery it has. I found out that it has a 18650 2200 battery, which I considered to be too little for what I wanted. To open it, you have to cut it about 1 millimeter deep between the black and white plastic, and then it opens easily. Be careful not to damage the circuit board though. Unlike the casing, the battery has a slot where you can easily replace it. With much less money, you can get a 12V UPS power supply with a 7AH lead-acid battery that will last you for several years.

I trusted the name legrand and bought 2 of these UPS for routers at home and at work. After a few months, both of them broke down and when there is a power outage, they don't supply power to the routers even for 1 minute. Something is wrong with their quality control at the company. Unfortunately, due to lack of time, I didn't take them for repair within the warranty. I have to buy routers of a different brand again.

Very bad purchase. After 4 months of use, its battery did not last even 5 minutes. In the 6th month, it did not last even a second. The 18650 battery it has cannot be replaced as the plastic casing is glued. If the battery replacement was possible, it might have been worth more.

We are talking about the ultimate disappointment, the device is garbage, it lasted only three months as it claims, 1 hour of autonomy, then nothing, not even a second... withdrawal

I bought it to put it in a typical ZTE H288A modem router. When it is connected to the router, it doesn't last even 1 second and shuts down. Without having it in the router, it lasts 3-4 seconds and shuts down. I have set the output voltage of the UPS according to the input voltage of the router and the battery indicator is full. I don't know if I have ended up with a faulty device. Otherwise, it is a fine device and looks nice for the living room, it just doesn't do its job.

Update: In the end, I bought the Lamtech mini UPS which works properly and is also 10 euros cheaper.

Stuck in the router. In a test that was done to it, it lasted 1 hour.
Update: About six months ago, the batteries died recently. As soon as the power went out, it would turn off. I replaced them (by a specialized person) and now it's working fine. I think it happened too soon. It disappointed me a little. That's why I'm giving it one star.

I have put it in a modem-router (with a 2 amp transformer) for VDSL line and its battery lasts about 2 hours! It doesn't heat up and it doesn't make any noise like the classic UPS, and it is small in size so it fits everywhere!