Wireless door magnetic contact MD-210R meian tech alarm

Functions and Specification:
1.Adopt special micro-power consuming CPU.
2.Working status automatically report.
3.Timely report when the door or window is not closed.
4.Working voltage: 3V
5.Transmitting frequency:433MHz
6.Transmitting distance: 200m (open area)
7.Dimension:8*32*24mm