The 4Relay is the required unit which works using the SPM-Main unit.

The SPM-Main communicates with the cloud through Ethernet or WiFi, and communicates with the SPM-4Relays through RS-485, which allows for multi-terminal and stable long-distance data transmission.

**Note : The Main Unit and 4-Relay of the Stackable Power Meter need to be used together. The Main Unit is connected to at least one 4-Relay to function.

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Sonoff 4CH R3 WiFi Smart Switch

Sonoff 4CH R3 is a 4-gang Wi-Fi Smart Switch with RF control designed to give you the ability to integrate smart control into your existing home. It has 4 gangs that can be used to control lights and other home appliances at the same time in four areas of your home.

LoA and Icasa approved.

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