Sonoff SPM Stackable Power Meter

Sonoff’s Stackable Power Meter (SPM) is a professional category, DIN-rail compatible, Sonoff SPM stackable relay with power meter and overload protection, with up to 20A per channel max. capacity. It can save consumption to a memory card (not an accessory).

Communicated by RS-485: The Sonoff SPM Main communicates with the Sonoff SPM-4Relays via RS-485, which enables multi-terminal and stable long-distance data transmission.
Overload Protection: Once the Sonoff SPM overcharge protection is activated, it protects your device from burns.
Works With Alexa & Google Assistant: You can directly ask your Amazon Echo Dot or Echo Show and Google Assistant speakers/smart displays to turn on/off your Sonoff SPM outputs independently.