icon e questoin

[bbbcd]

in my icon e manual it says:
warning only use a 9 volt rechargable battery
does that mean i can only use a rechargable battery or can i use a normal 9 volt?

[See65]

I have used a regular 9 volt in mine with no problems.

[bbbcd]

i thought that sounded stupid
also i put a normal one in and it worked but i just wasnt sure