Wireless transmitter, it sends wireless signal to the control panel when it is triggered. Installing place:door, window, draw, cabinet....so on. Specification: 1. triggered :<1.5cm 2. Working voltage:12V 3. Working current:<10mA 4. Static current:≤5μA 5. Working frequency:433.92 MHZ?KHZ/315 MHZ 6. Emitting frequency:>10mw 7. Frequency tolerance:?.2MHz