ERA-DCKIT-2 
Typically, these products use a narrowly focused infrared beam that goes between two sensor-type devices; one of which produces and one that receives. When the beam is interrupted, the chime or sound goes off alerting you to customers. The technology is pretty simple when you think about it and this handy product is a great solution for any business. Beam Entrance Alerts typically use either PIR (Passive Infrared) or break beam (reflector shoots beam back, triggered when broken) to detect motion or movement through a monitored zone.
They are in essence, an integral part of your customer service team. They can serve multiple purposes, although they are most often used as part of a much larger security type system. With an invisible beam, it is no longer necessary to hover around the front door, waiting for the next customer.
These versatile products can also be used at home to keep people from entering your home if need be. They are a great addition to any home security system and they are especially useful for people who simply cannot hear a knock at the door. Typically the chimes are adjustable, so they can be raised or lowered to the perfect pitch.
Beam Entrance Alerts Offer Practical, Present-Day Uses
It seems that in the end, the invisible beam is not really a thing of the future, but a handy application that can be used right here and right now, for a myriad of purposes. Entrance alerts are great products and may be used to greatly enhance your current security or customer services programs. Here are some popular options:
- Model BALERT - Beam Alert for monitoring doorways and other applications
- Dakota Alert DCMA-4000 Driveway Monitor - A Dakota Driveway Alarm with Long Range Power
- ERA-DSDCR - Wireless Driveway Alarms Like the ERA-DSDCR A Keep Intruders Away by Alerting You When an intruder approaches