I have used it for almost a month and the service is really great. It extends the range of WiFi massively and because of the 2.4GHz antennas, there is barely any signal loss even after being 50 feet away from the router or 5 floors above.

Many people complain about the connection problem in the online reviews but I have never faced such problem. Connecting it is really easy and takes only a couple of minutes. Once it is connected then it automatically connects with the router from next time.

You can always control it from the Mi Home app and you can adjust settings like 'Network Name' and 'Password'. You can even make it invisible to others and check which devices are connected to it.

It can be powred by any 2.0 USB port delivering 5.0V === 1.0A output.
You can use an adapter for it or a power bank. 'Oraimo' is one of the best adaptors available in the market and the adaptor comes with a 1-year warranty.

Mi Wi-Fi Repeater 2 Specifications

Compatible with Mi Home App
Easy 3 Step Setup Process
2 High-performance PCB Antennas
Connectivity – USB 2.0
IEEE 802.11 b/g/n (2.4GHz)
Transmission Speeds up to 300mbps
Up to 180° Rotational Adjustments
LED Indicator, Reset Button
Dimension – 120 x 30.2 x 9 mm
Weight – 50g
Color – White
In the Box – Device, Manual

Oraimo Adapter Specifications
Input – 100-240V – 50/60Hz 200mA
Output – 5.0V === 1.0A