... zone by real time through long-distance Specification:1. Wireless frequency: two option: 433MHz or 315MHz2. An adaptor ... , indoor: 30~50m, (depend on the surrounding environment and wireless interference)4. Standby current: < 15mA5. Alarm volume: internal ... wireless smoke detector, gas leakage detector, vibration sensor, siren with strobe light, flashing siren, horn siren, remote control, all sensors ...