Sonoff mini Hack. No neutral? behind light switch No problem! No Live wire! #ElectronicsCreators - YouTube
SmartWise 230V single-live-wire (no neutral) 1-gang smart WiFi relay switch - eWelink Store
Sonoff Zbminil2 Smart Switch No Neutral Wire Required Smart Home 2 Way | Fruugo NO
SONOFF ZBMINI-L Zigbee 3.0 Smart Switch – No Neutral Wire Required, APP & Voice Control, Mini Home Automation Modules Compatible with Google Alexa : Amazon.in: Home Improvement