Cant get mush more numpty proof to be honest, Rob.
If you get it get some rechargable battery's for it and a charger. Uness you've got a USB port on your trolley then I think you may not need battery's, but don't quote me on that.
You definately want some rechargeable batteries as they suck the life out of normal ones in minutes. I have 1800maH ones in my g5 and they do 3 rounds on a full charge.
I bought one about a year ago. Great bit of kit if like me you dont like wearing a watch gps. Small and compact (put mine in my drink holder on my trolley during rounds) shows measurements to front,middle and back and can move the flag position to give you a better yardage to flag. As said though get some good rechargeables as it eats batteries.