... wires zones 2. Long-distance monitoring and alarm protected zone recheck 3. 8 LED to indicate the alarm zone.4. to program ... internal :95dB, external siren: 110~120 dB6. One control panel with one internal siren: working voltage:+9 DCV,200mA.7. two ... sensor: wireless smoke detector, gas leakage detector, vibration sensor, siren with strobe light, flashing siren, horn siren, remote control, all sensors ...