Even with the voltage and amps (as above), you need to know what SIZE the adaptor is, and I couldn't find that info online. Your best bet is to buy a variable adapter such as http://www.amazon.com/PowerLine-600mA-Universal-Adapter-Compatibility/dp/B0042X8XNW/ref=sr_1_2?s=electronics&ie=UTF8&qid=1325640807&sr=1-2
The size tip is NOT related to the number of volts. It is independent.
after looking at mine a little closer it's as if its 5 little LED lights off together encased in plastic. I do not see a way to replace it no I have ever seen a product like that in the light bulb department. I will say that I've had mine since 2010 and I've never had a problem with it as long as the batteries are fresh. Hope that helps