The Aiphone LEM-1DLS single-door Access Sentry System starter kit includes one door intercom, one master intercom, and an AC transformer to enable audio communication with visitors at a door prior to granting access using the door-release button. The door-release button works with an electric strike (sold separately) to remotely unlock the entrance for the visitor. The master intercom emits an audible signal to indicate an incoming call from the door. Pressing the push-to-talk button allows the master intercom operator to talk to the visitor, and releg the button automatically transmits sound from the door intercom. The chime and audio volume is adjustable on the master intercom. The housing is black plastic for the door intercom and white plastic for the master intercom. The master mounts to a desktop or wall using the included mounting hardware. Additional LEM-1DL master intercoms (sold separately) can be connected to the system using an Aiphone DAK-2S adapter (sold separately) to extend coverage into other rooms; each additional master requires its own AC transformer or DC power supply (sold separately). SpecificationsOverall dimensions (master intercom)7 x 5-1/2 x 2-1/4 inches/180 x 143 x 55 mm (H x W x D)*Overall dimensions (door intercom)4-3/4 x 3-7/18 x 1-1/8 inches/120 x 88 x 29 mm (H x W x D)*Communication output100 mWMaximum distance from door/sub to master650 ft. using a 22 AWG wire, 1,600 ft. using an 18 AWG wireCompatible wiresAiphone 822202 or 821802 (sold separately)Door strike connectionNormally open maximum 30VAC or 30VDC at 1 amp door release such as Aiphone EL-9S (sold separately)Power requirements12 to 16VAC or 12 to 24VDC. Requires Aiphone PT-120N AC transformer or Aiphone PS-12C DC power supply (sold separately)*H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back. Door intercom systems allow an occupant of a building to communicate remotely with a visitor through at least one door intercom and master intercom. Master intercoms with a door-access button remotely unlock the door for the visitor. Aiphone manufactures intercom systems for residential, business, and healthcare structures. The company, founded in Japan in 1948, has its North American headquarters in Bellevue, WA. Aiphone meets International Organization for Standardization (ISO) standards 9001 and 14001. WHAT'S IN THE BOX? * LEM-1DL master intercom * LE-D door intercom * PT-1210N AC transformer

Adjustable chime and audio volume. Door intercom is weather resistant. Door-release button controls an electric strike (sold separately) to remotely unlock the entrance for a visitor. Single-door intercom system includes master intercom, door intercom, and AC transformer to enable audio communication with visitors prior to granting access.