... Long-distance monitoring and alarm protected zone recheck 3. 8 LED to indicate the alarm zone.4. to program 6 phone ... , two flat pins, three pins customized3. Wireless receiving distance in open place: >250m, indoor: 30~50m, (depend on the surrounding ... detector, gas leakage detector, vibration sensor, siren with strobe light, flashing siren, horn siren, remote control, all sensors as we selling ...