Sonoff Stackable Power Meter 4 Relay

SONOFF Stackable Power Meter realizes smart management with overload protection, metadata monitoring and electricity statistics, support power-on state (the firmware of the main unit, 4-relays is upgraded to the version 1.2.0 and the eWeLink app is upgraded to 4.23.0). 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.