Hi,
I've only used it as a 10m target for air rifle and pistol but reading the info online it says can be used at 50m https://www.euroshooting.eu/en/index.php?detail=HS1050 cable length is only around 10m, so would need suitable cable for 50m.
I had to download software from the sius website for my laptop in order to use it, had initial connection problems but their support website is superb and walked me through the setup as it was down to something I'd done.
Regards
Matt