via QR code is link is in Chinese language only and application from Google store is not working seems to me, so I have to call some electricians to be able to function this switch. Very complicated pairing with wifi. this is very bad a poor support, small card with instruction in english is not enough as it seemsto be not complete how to everything wired.
Works perfectly This switch works with Alexa, Google, DuerOS, Tecent, DingDong, Rokid and Tmall Genie