SONOFF Smart Stackable Power Meter | SPM

【UP to 32 SPM-4Relays】One SPM-Main connects up to 32 SPM-4Relays. Each relay includes 4 isolated channels for organized and scalable device control.【20A per Channel】Each channel supports up to 20 amps, making it ideal for high-power devices.【Overload Protection】Automatically cuts off power during overloads to protect your devices and ensure system safety.【MicroSD Storage】Store over 20 years of power data and up to 20,000 operation logs per device. Quickly export consumption reports via SD card.【Power Monitoring】Track real-time current, voltage, and power usage through the eWeLink app for smarter energy management.