Byron 1200 Manual De Instrucciones página 3

The Underdome bell is powered by an 8 volt 1 amp transformer (not supplied)
Wire the bell to terminals 1 & 2 as shown in
GB
diagram.
Replace the dome cover and gently tighten the screw, adjust dome clock-wise or
anti-clockwise for best tone.
IMPORTANT - DO NOT WIRE DIRECTLY TO THE MAINS. IF IN DOUBT
PLEASE CONSULT A QUALIFIED ELECTRICIAN