... connect with the alarm receipt managing centre SPECIFICATION:1. Wireless frequency: two option: 433MHz or 315MHz2. An adaptor ... 200m, indoor: 30~50m, (depend on the surrounding environment and wireless interference)4. Standby current: < 20mA5. Alarm volume: internal ... sensor: wire siren, wireless smoke detector, gas leakage detector, vibration sensor, siren with strobe light, remote control, all ...