
I have purchased several smart dimmers and smart switches for various one and three position switches in my home. Installing a single switch is fairly easy, but three position switches require a little extra work. It is best to read and follow the printed instructions inside to install a 3 position switch, otherwise there is a risk that the smart switch/dimmer will only work when the other normal switch is on. Looks like someone commented that the 3 position switch doesn't always work for them. I suspect they didn't read or follow the installation instructions for the 3 position switch, so it only works when the normal switch is in a specific position.

Remotec ZRC-90US & BW8510US | Cert ID ZC10-15100007
9 Review

SONOFF SNZB-03 ZigBee Motion Sensor: Wireless π¦ Alerts and Light Trigger with SONOFF Zigbee Bridge
9 Review

π Aqara Cube - Zigbee Connection, Smart Home Device Controller with 6 Customizable Gestures, 2-Year Battery Life - Works with AQARA HUB and IFTTT
16 Review

π BroadLink Smart Button: 3 Way Dimmer Switch Control with IFTTT and Alexa, Wireless Home Automation Hub Included
9 Review

Fulham WorkHorse WH2-120-C Adaptable Ballast - 2 Pack
3 Review

Wireless Electronic Ballast Interface Certified
8 Review

π‘ Electronic FL Ballast ICN-4P32-N (Formerly ICN-4P32-SC) for 3-4 F32T8 F40T8 F17T8 Lamps, 120V/277V Compatibility
5 Review

π‘ High-Quality Advance ICN-4P32-SC Electronic Fluorescent Ballast: Ideal for 4 Lamps, 32W T8, 120/277V
3 Review