Wireless indoor alarm siren designed to work with the Ajax security system, delivering a powerful alert sound of up to 105 dB when triggered. It connects securely to the Hub using the Jeweller protocol with a communication range of up to 2000 meters and features an LED indicator. Easy to install for indoor use and powered by long‑life batteries that can last up to 5 years, making it an effective addition to home and office security setups.