8027-B VU Meter led power

[schrobbelbop]

Hi,
anybody knows if the 8027-B VU Meter from hairball
needs 12volts? are the 2 led connected serial internally?

If it's 12V I can connect 2 meters in series to my 24V transformer
in my dual 1176?

 

[Echo North]

She needs 5.6-7.6V  DC.

There are 2 LEDs inside.