This pump is fantastic. It comes with a mains charger and a cigarette lighter charge cable, which allows you to charge it on the go. You can also charge your phone on the go which comes in quite handy. I have personally used it on a 15psi and a 17psi board without any issues and the auto-switch off works perfectly fine.
This pump is perfect for what I needed. It's not cheap, but I can see why, as it inflates 5 paddle boards on a single charge, and it charges quickly without being near my car. If the charge does run out, then you can just plug it into your car and you can still use it. It automatically switches off when it reaches the psi level which is so handy!