How does the BlueCon Nightrider work?

Hello, how are you?
I have a question about this device.
How it works and if something is needed apart from this to work.
And what a last time as I read is reusable.
Thanks in advance.

It is a device that you put on the freestyle sensor and scan every 5 minutes by NFC and send it to your mobile via Bluetooth (iPhone and Android).You have to hold it with some type of bracelet.The app is called Linkblucon but the readings may not be as precise as those of the freestyle (in my case they are not).I bought it and I have used it on my iPhone with the XDrip app (I have the beta version, which allows capillary calibrations and is going quite fine).I have it in a drawer and I don't use it.I recommend the use of freestyle and the freeing app or the official reader, without more.In the end it is the best (I'm talking about my experience ...)