matty
ANSWER MY QUESTION PLEASE IM PANICKING!

John H
Who told you you need to know the voltage? Go to any department store and look in the camping section(I went to the Walmart camping section for this exact same item just a couple of days ago) The important thing is that the adapter for the hole on the mattress is the same. As far as the voltage is concerned, they sell about 4 basic models. The bottom line isn't what voltage it is, but what you want to power the air pump up with. You can either get a pump that uses a wall outlet, one that uses your socket from a truck or car, or one that uses a 6 or 4 volt battery.

Sgt. Pinback
I was able to find the pump w/ chargers as well as the AC and DC chargers individually available from aero directly: Rechargeable Dual Power NiCd Battery Power Model 109 DC $30 109 DC Car Adapter $10 109 AC Charging Adapter $10 I think yours is the 109 model if not browse through the accessories page here If yours is the 109, they use 13.8v DC on the AC adapter which makes sense since it is also runnable on automobile 12v DC which is also 13.8v so it is a perfect match to use the low cost adapters for both home AC and auto. It also is rated for 400mA which also has a lot to do with the charge time for the NiCad batteries, they say 12h so your NiCad capacity is probably 12h x 400mA = 4800mAh which is a nice size battery. If none of this makes sense to you just order the replacement from Aero if you use the wrong charger it can damage your battery. cheers