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Buy MANYCAST Wireless (Radio Frequency 433 MHz, not wifi) PIR Motion Sensor, Works In Pair With Avance Dual Band Alarm System Control Panel Only. Does Not Work With WIFI On Standalone Basis.
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Amazon.com : Dakota Alert MURS HT KIT - Motion Sensor Kit - Alert Transmitter Box & Handheld M538-HT Wireless VHF Transceiver Kit - License Free Multi Use Radio Service MURS Radio Handheld :
![Wireless sensor scenario (radio frequency identification (RFID) system). | Download Scientific Diagram Wireless sensor scenario (radio frequency identification (RFID) system). | Download Scientific Diagram](https://www.researchgate.net/publication/283714333/figure/fig1/AS:294886739460096@1447317885146/Wireless-sensor-scenario-radio-frequency-identification-RFID-system.png)