Hi need to replace the LED`S for my knocklink and wanted to know what voltage i need as ive looked on Maplins and there are a few different ones

any size 5 volt will be fine

so 12 volt wont work?

Not really - you need 5 volts, as the man said..... When I replaced mine, to make a remote mount, I used 4 standard 5V 5mm LEDs and a single 'BRIGHT' red (its clear and goes red when on) 5V 5mm LED.

Hope this helps,

Mark