Volume of doorbell: 90db Switch is not included; A good replacement for the old and broken one. External wired doorbell for security access control connect to 12VDC power directly. External wired doorbell for access control system; Need to work with the access control system built-in bell function. The people from the outside press the doorbell button on the access control unit, this doorbell will sound "Ding-Dong" tone and notify those inside that there is someone wanting to come in., Weight: 0.14770971554 Pounds, Manufacturer: UHPPOTE