1.Wireless emitting distance: open area: 150m
2.Emitting frequency: 433MHz
3.Programme code: 1527
4.Voice volume: 108±3dB/m
5.Built-in rechargeable battery
6.Can add 20 remote control or detectors, use as an alarm equipment
7.3 seconds alarm delay, to avoid the same frequency interference
8.Can compatible with all brand alarm systems