Shelly's add-ons attach to a host device through a proprietary serial interface and add sensor inputs, an RS485 Modbus link or a LoRa radio.
The Plus Add-on and the Pro Sensor Add-on take DS18B20 and DHT22 sensors, the Pro Modbus Add-on works as a Modbus client and server, and the LoRa add-ons list a range of up to 5 km. The line also includes the Shelly Shutter, the Pro Dual Cover / Shutter PM, The Pill, the Shelly-X-MOD1 module and the first-generation Uni. The LAN Switch is a five-port DIN-rail Ethernet switch.
The Shelly Shutter (S3SH-0A2P4EU), the Pro Dual Cover / Shutter PM (SPSH-002PE16EU) and The Pill (S3SN-0U53X) are standalone devices with their own model codes.
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Shelly add-ons and modules. Smart Home Canon. https://smarthomecanon.com/lines/shelly-add-ons-and-modules. Last checked 2026-10-13.