Dahua Technology ASA1222E-S - 2.3 Dimensions

Chart 2-2
Figure 2-2
Bell Connection steps:
Step1: Remove 4 screws with a screwdriver, then disassemble the device.
Step2: Connect the 3 pin for electronic Bell
Step3: Covered the rear panel, and assemble the device
2.3 Dimensions
Figure 2-3