http://www.precisioncaging.com/faq.htm
Apparently that's it - you have to use a bulb or ceramic to heat it - and it looks as if wiring or caging that off to keep the animal from getting burnt is entirely in your hands. Speaking only from drudging through the website though - I have personally never had one. I am leaning toward some of these @ $30 a pop at this point:
http://www.reptiletubs.com/rtvepics.htm
VE 175 Dimensions: 20 7/8"W x 52 7/8"L x 14 1/16"H (also available in solid green as a special order)
1-10 $30.00