Door Chime When a Door Opens: Business Entry Alert Guide

Quick answer: a business entry chime sounds when someone opens or walks through your door, so staff in the back know a customer has arrived. There are four ways to trigger one: a magnetic door contact that senses the door opening, a motion sensor that watches the doorway, a beam sensor across the entry, or a mechanical chime on the door frame that needs no power at all. Pick by whether your door stays closed or propped open, and by how far the alert has to travel.

Four ways to trigger a door chime

Trigger	Sounds when	Best for	Example
Magnetic door contact	The door opens	Doors that stay closed	ERA-UTDCR
Motion (PIR) sensor	Someone moves through the doorway	Doors that stay open, entry areas	ERA-PIR-SPK
Photo beam	Someone crosses the beam	Wide or open entries, hallways	BALERT-W
Mechanical	The door swings open	Small shops, no power or batteries	EZCHIME (EZ Tone DC1)

Magnetic door contacts: sound when the door opens

A door contact has two pieces: a transmitter on the frame and a magnet on the door. When the door opens and the magnet moves away, the transmitter sends a signal to a receiver in the back room. This is the most precise trigger, because it reacts to the door itself, not to people walking past it.

ERA-UTDCR (4,000 ft)

The ERA-UTDCR is built for businesses. Its ERA-UTX transmitter works as either a door contact or a push button, is outdoor rated, and runs 18-24 months on its CR-2 lithium battery. The ERA-DCRX receiver has 4 zones, 12 melodies and 4 volume levels, plus four 12V DC outputs and one C-form relay for adding a strobe, siren or bell. With a 4,000 ft range, it can reach a back office, a shop floor or a separate building.

Dakota Alert SR-4000 smart receiver (5,000 ft, phone alerts)

The SR-4000 is a plug-in receiver for Dakota Alert 4000 Series transmitters. It chimes on site and also sends push notifications through the Dakota Alert app over Wi-Fi, so an owner can see door activity when away from the building. It supports up to 16 sensors and has 2 relay outputs plus one 12V DC output. To buy it with a push button or door contact, see the UTSR-4000 kit.

SS130 (600 ft)

For a small office or a single door close to the receiver, the SS130 pairs a magnetic door contact with a plug-in receiver: 58 melodies, 4 volume levels up to 90 dB, and a blue LED that flashes for about 10 seconds when triggered. Its page lists 600 ft in open air and 50-150 ft through metal security doors and walls.

Motion sensors: when the door stays open

A door contact cannot help when the door is propped open all day. A motion sensor watches the doorway instead and sounds when someone passes through.

• ERA-PIR-SPK: mounts over the door and plays the chime right there. It needs no separate receiver. It has three chime sounds and four volume levels, its bracket tilts about 160 degrees, and it runs on a 9V battery with an expected 1-2 year life. The SS130 and EZCHIME pages both point to it for doors that might stay open.
• ERA-PRDCR: an indoor ERA-PIR motion sensor paired with the ERA-DCRX receiver, for when the chime needs to sound in another room. The receiver takes up to 12 sensors.
• SMAPR-4000: an indoor Dakota Alert motion sensor with the SR-4000 smart receiver, for phone notifications.

Photo beam sensors: across an entry

A photo beam sends an invisible beam to a reflector across the doorway. When someone breaks it, the chime sounds.

• BALERT-W (Seco-Larm): wireless. The sensor-to-reflector span reaches up to 22 ft, and the signal to the chime reaches up to 328 ft line of sight. Its page lists storefronts, hallways, waiting areas and delivery doors.
• BALERT (Seco-Larm): the wired version, with a beam range up to 22 ft, adjustable speaker volume from 0 to 90 dB at 1 meter, and alarm duration from 3 to 30 seconds.

Mechanical chimes: no power, no batteries

The EZCHIME (EZ Tone DC1) mounts on the door frame with a small magnet on the door and plays a gentle "ding" when the door opens. It needs no power or batteries. Its page describes it as loud enough for stores or offices up to 2,000 sq. ft., and works on in-swinging and out-swinging doors. It is a good fit when the door generally stays closed and the counter is in the same room.

How to choose

1. Does the door stay closed between customers? Yes: a door contact or mechanical chime. No: a motion sensor or photo beam.
2. Where does the alert need to sound? At the door: ERA-PIR-SPK or EZCHIME. In a back room or another building: a transmitter plus receiver, such as the ERA-UTDCR.
3. How far, and through what? Concrete block, metal doors and long distances call for the 4,000 ft ERA Series or 5,000 ft Dakota Alert 4000 Series.
4. Do you need more than a chime? The ERA-DCRX, SR-4000 and RE-4K-PLUS receivers have outputs that can drive a strobe, siren or bell.
5. Do you want alerts on your phone? Choose a kit with the SR-4000 smart receiver.

Several doors, one receiver

An ERA receiver takes up to 12 transmitters, and a Dakota Alert 4000 Series receiver takes up to 16. Give each door its own melody so staff can tell the front entrance from the loading door or the back door without walking over to check.

Frequently asked questions

Will a door contact sound every time an employee goes in and out?

Yes, a door contact cannot tell customers from staff. Many businesses put the employee door on a different melody, or use a push button there instead of a contact.

Can I add a strobe light for a loud shop floor?

Yes. The ERA-DCRX receiver in the ERA-UTDCR has four 12V DC outputs for accessories such as a strobe or siren.

Does any of this need Wi-Fi?

Only the SR-4000 smart receiver uses Wi-Fi, for phone notifications. Everything else works on its own radio link.

Compare every option in the entry alerts collection or the business chimes collection. For retail specifically, see shop bell vs electronic entry chime.