Byron 771 doorbell.

• Produces classic "ding dong" sound.
• 80dB maximum.
• Requires 8V 1A transformer or 1x 9V PP3 battery (sold separately).
• Simple 2-wire installation.
• Includes wall fixings.
• Doorbell push button sold separately.
• Suitable for indoor use only.
• Dimensions (mm): 120(H) x 80(W) x 36(D).