They are using the ewelink app:
https://www.aliexpress.com/item/Ewelink-App-Touch-Light-Switch-EU-UK-Wifi-Dimmable-Wall-LED-Dimmer-Switch-Google-For-Smart/32914440062.html?ws_ab_test=searchweb0_0,searchweb201602_2_10065_10068_318_319_317_5728815_10696_450_10084_10083_10618_452_535_534_10304_533_5025915_10307_10820_532_10821_10302_204_328_10059_10884_323_10887_100031_320_321_322_10103_448_449,searchweb201603_1,ppcSwitch_0&algo_expid=e29d32f3-9871-4f94-b932-b6cae2869a41-0&algo_pvid=e29d32f3-9871-4f94-b932-b6cae2869a41
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They are using the ewelink app:
https://www.aliexpress.com/item/Ewelink-App-Touch-Light-Switch-EU-UK-Wifi-Dimmable-Wall-LED-Dimmer-Switch-Google-For-Smart/32914440062.html?ws_ab_test=searchweb0_0,searchweb201602_2_10065_10068_318_319_317_5728815_10696_450_10084_10083_10618_452_535_534_10304_533_5025915_10307_10820_532_10821_10302_204_328_10059_10884_323_10887_100031_320_321_322_10103_448_449,searchweb201603_1,ppcSwitch_0&algo_expid=e29d32f3-9871-4f94-b932-b6cae2869a41-0&algo_pvid=e29d32f3-9871-4f94-b932-b6cae2869a41