It's a ZTE MF627 modem.
Prepay Dongle you buy credit like you would for a mobile phone and top it up, there are varios top up packages but the basic one which I will be using as it's only for when I am away in the van is £10 gets you 1GB = to 650 emails, 30 hours surfing, two 30 min download videos and 60 music tracks, expires in 30 days if not used.
You could also choose to just top it up with whatever amount and just say surf or email and that does not expire, but if you go over the useage then you pay extra.
I only need my email and surfing when away so more than adequate for my needs.
Comes with lots of instructions and info and the software and helpline numbers and addresses.
I am very pleased only cost the postage to get it.
HSDPA 3. 6
GSM/GPRS/EDGE 900/1800 MHZ
MicroSD Card Upto 4GB
Windows 2000/XP and Vista
or MAC OSX 10. 4. 11 +
Some technical stuff on it.