BroadLink International - Now, S1/S2 can be used in European region as well. Use ihc for eu to setup S1/S2, then you could use sensor in BroadLink APP and Alexa. Google home
IHC for EU: BroadLink RM Mini 3, Alexa e il tuo telecomando
ihc for EU - BroadLink | Voice App Perf in United Kingdom by Shirkalab
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Broadlink Smart Home Rmmini3 Wifi+ir+4g Remote Control Work For Alexa Google Home Ifttt With Au Uk Us Eu Plug Ac Tv Controller - Automation Modules - AliExpress
Broadlinkオリジナルスマートホームオートメーションリモコンihcアプリwifi ir rf 4グラム音声コントローラの仕事alexaためgoogleホーム|スマートリモコン| - AliExpress