BL-D40 External Sounder

The BL-D40 is capable of emitting four different types of alerts both
audible and visual – Bell, Door Chime, Siren, and Strobe Light.
 The bell always sounds when the controller’s doorbell button is
pressed.
 The door chime can be programmed to sound whenever the
controller unlocks the door. The door chime does not sound when
the REX button is used to open the door.
 The siren can be programmed to sound when the case of the
controller is opened or when the controller is removed from the
wall. The controller can also program the length of the siren.
 The LED on the BL-D40 turns on when there is a bell or door
chime. If there is a siren, it flashes as long as the tamper switch is
activated or opened.