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EACHEN 433MHz RF Strobe Siren RF-ST Works with Sonoff RF Bridge (eWelink APP) - EACHEN-DIY YOUR SMART HOME
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aixi-SHS 433Mhz Strobe Siren Security Alarm System Compatible with Wi-Fi 433Mhz Sonoff RF Bridge - EWeLink APP (Outdoor Siren Alarm System + Bridge) : Amazon.co.uk: DIY & Tools
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DIY basics- Using a Sonoff DW1, RF Bridge + 12v delayed siren Alarm ! Link to delay siren vid below. - YouTube
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