Monoprice Wireless Smart 120dB Siren Alarm and Chime – White with Strobe Light, Remote App Controlled, Compatible with… Price: $23.58 (as of 06/10/2022 23:35 PST- Details)

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24/7 Remote Monitoring: Tap into your mobile device to monitor and control your siren and alarms directly from your smartphone or tablet, from anywhere in the world, at any time. The siren is a perfect panic alarm in case of an emergency.
Timer Controls: The scheduling feature allows you to set a timer or schedule to sound your alarm, chimes, or sirens at particular times of the day, allowing you to automate your whole home security system.