IR detector with built-in transmitter for use with Nexa receiver or wireless door bells. The detector sends a wireless signal to a receiver when it detects motion within the detection area. Type of receiver, power switch or door bell is selected with a switch. When using with a wireless doorbell, time delay can be set from 15 sec to 4 min (7 choices). The detector can also be controlled by ambient light, resulting in no activation until darkness sets. Sealed design, can be used outdoors. Powered by 3 pcs. batteries of type LR6/AA (not included). Transmitter range: approx. 25 m. Frequency: 433.92 Hz