which can detect motion and send out powerful ultrasound, accompanied at the same time by an alarm sound and LED flashlights, which makes animals uncomfortable to drive animals humanely ...

There’s a huge market for 433 MHz alarm system hardware out there, from PIR motion detectors to door ... have it toggle a relay hooked up to a loud siren. Even if you aren’t looking to make ...

From the same Amazon-owned brand that makes the security cameras, the Ring Alarm system comprises a base station, a contact sensor, a motion detector ... On top of having the siren ringing ...