50 ft. detection range 3 AA batteries last up to 2 yrs. Wireless Announcer Indoor Sensor 17 ft. This receiver works with up to 3 outdoor or indoor sensors. It plays a chime when visitors are detected. Each sensor can have a different chime tone to identify point of entry.
Volume is adjustable.
In addition to chiming, the deluxe receiver adds an alert mode. In this mode it has the ability to control a relay output that can be used to activate a siren, turn on lights, etc. There is also a power output terminal that can directly drive a small siren. There is also an exit delay setting gives you time to leave a monitored area. It also has 3 LED lights to give a visual indicator of each of the 3 zones.