Small Sonoff like the Sonoff mini - fits in US junction box.
【 APP Remote Control 】eWeLink APP enables you to control all SONOFF devices anywhere with one tap via iOS & Android smart phone, no distance
SONOFF Mini R2 10A Smart WiFi Wireless Light Switch, Universal DIY Module for Smart Home Automation Solution, Works with Alexa & Google Home
1/30 Pcs Sonoff Mini Wifi Switch R2 Diy Two Way Smart Switch Relay Module Wireless Switch Smart Home Automation Work For Ewelink - Automation Modules - AliExpress
SONOFF MINI - Two Way Wi-Fi Wireless Smart DIY Switch
1/3 MINI R4 WiFi Switch. MINIR4 is a smart switch with the gateway function of “eWeLink-Remote“. DIY Smart Switches. Smart Wall Switches. Smart Plugs
SONOFF MINI R4 Wifi Switch Module 2 Way Switch Smart Home Relay APP Voice Remote
DIY Smart Switches - SONOFF Official
SONOFF MINI DIY Wifi Smart Switch Two Way Switch Via APP Remote Control Swi.AG
SONOFF ZBMINI ZigBee Mini Smart Light Switch(2 Way), Compatible with Alexa, SmartThings Hub, Google Home & SONOFF ZBBridge, ZigBee 3.0 Hub Required, Neutral Wire Required, 2-Pack
Sonoff Mini R2 - small WiFi smart relay switch with DIY mode (REST API) - eWelink Store
Sonoff MINI DIY Two Way WiFi Switch - Small form factor - CanHobby