The standalone alarm horn is design for people want simple and inexpensive alarm system. It will detect and alarm immediately when thief intrude in<br>The alarm siren can not use as a standalone alarm system,it can work with other accessories as a alarm host <br>The alarm siren can learn additional accessories to achieve remote control,provide user a security and convenient life.<p><b>Product Features: </b><br>1. The horn support up to 30 pcs detectors,8pcs remote key fob,4pcs doorbell sensor <br>2. Wireless sensor universal learning.  <br>3. Wireless remote control universal learning.  <br>4. The remote control to disarm, arm.  <br>5. Live sound alarm.<p><b>Technical parameters: </b><br>size: L * W * H 12mm * 10.2mm * 11mm  <br> Power: AC 110V ~220V  <br>wireless operating frequency: 433MHz  <br>environment: stability: 0 -55 , Relative Humidity: 40% -70% <br> the alarm sound: up to 120 dB <p><b>Package including:</b><br>1x Host speaker <br>1x AC Adapter <br>1x English manual <p><b>Please note: </b><br>Before using,please kindly read manual<br>If you have any question or other need,please email our customer service fuers.csc01@outlook.com ,we will give you professional reply in time at our work time 6PM~4AM PST,thanks.