The Sonoff SPM-Main Smart Switch allows for the measurement of power consumption and supports connectivity via Ethernet and Wi-Fi. It can handle up to 128 channels – you can combine it with up to 32 SPM-4Relay switches (each with 4 channels), which are sold separately. Additionally, the overload protection prevents damage to your devices. The product is also very easy to install.

The SPM-Main switch has proven itself in many different applications. For example, you can find out how much electricity your tenants consume per month or determine the energy usage of a shopping mall or office. The product will also be useful in a server room or cryptocurrency mine – the overload protection feature allows you to avoid damage to specific devices.

Enjoy the ability to connect devices. The SPM-Main communicates with the cloud via Ethernet or Wi-Fi connectivity. It can also be connected to SPM-4Relay switches via RS-485, ensuring stable transmission over long distances. Connectivity issues are a thing of the past!

Do you want to monitor changes in power consumption in each room of the office? Or do you want to know how much electricity your tenants are using? With Sonoff, it's possible! With the SPM-Main and SPM-4Relay switches, you can measure power consumption accurately. All information can be found in the eWeLink app, allowing you to check power usage without leaving your home – just grab your phone!.