OK hope someone here can help.

I just bought the above servo for a project I am working on with my son (A radio controlled K9 for all the Dr Who fans out there!)

Problem is it came with no spec sheet/instructions, I need to know what the operating voltage is!

I have tried:
Searching this site, no luck.
Contacting Rovan in the US, no help.
Contacting the supplier (He said 6 Volt but I didn't get a warm feeling that he really knew!)
Searched the internet, many times!

So can anyone help me? Please.

OK got a reply from Predator RC here in Australia:
Supplier has come back with 6v -7.2v lipo 2s is ok. Max 7.4 anything beyond would fry it.

So all good.