The 2 buttons switch comes with attachable relay holders. Shelly Wall Switch for Smart Relays can fit into any existing wall switch console or even the tiniest spaces, due to its compact dimensions and simple wiring. Relay holder 1 - Shelly 2.5. Relay holder 2 - Shelly Plus Series (upcoming devices) Relay holder 3 - >Shelly<b> 1L <b>Shelly<b>. Shelly Plus 1 - httpsbit.ly3cylzUaShelly Plus 1PM - httpsbit.ly3qXyUhd Shelly just released a new line of smart relays called Shelly Plus 1 & Shelly. Conrad - your technology specialist. More than 550,000 products for professionals. 95 years of experience in electronics, information technology, mea. quot;>. Contents hide 1 Shelly Plus i4 Controller with 4 Digital Wi-Fi Inputs For Advanced Control of Actions 2 USER AND SAFETY GUIDE SHELLY Plus i4 3 Product Introduction 4 Installation instructions 5 Specification 6 Declaration of conformity 7 FCC Warning 8 Documents Resources 8.1 Related Manuals > Resources Shelly Plus i4. Furthermore, you can use Shelly Plus i4 to set the light color you want or for dimming of your smart bulbs. All you have to do is add and configure one of our scripts or webhooks created specifically for Shelly Plus i4. Learn how. Perfect match. Shelly Plus i4 is perfect for Shelly Wall Switch for Smart Relays 4 button switch..