... . Long-distance monitoring and alarm protected zone recheck 3. 8 LED to indicate the alarm zone.4. to program 6 phone ... *120 °horizontal+60°vertical10. Optional sensor: wireless smoke detector, gas leakage detector, vibration sensor, siren with strobe light, flashing siren, horn siren, remote ... goods meet problem on customer side,we can repair or change a new one for customers if that is notcaused by ...