Sonoff SPM-Main Smart Stackable Power Meter (Main Unit) Connect up to 32 SPM-4Relays White

Connect up to 32 SPM-4Relays- One SPM-Main can be connected to 32 SPM-4Relays. Each SPM-4Relay has 4 isolated channels to help you manage devices more conveniently.Max. 20A/Gang- Each channel can support a maximum current of 20A, with no fear of high power load.Overload protection- Once the overload protection is enabled, it can protect your devices from burning out.Micro SD- SD card plays a more significant role, like exporting electricity consumption data quickly, storing more than 20 years of historical electricity consumption and each meter relay can save 20,000 operation logs.Power metering- Obtaining current, voltage, and power easily. You can monitor the consumption statistics of 4-Relay by checking eWeLink App on your mobile phone.

Connect up to 32 SPM-4Relays: One SPM-Main can be connected 32 SPM-4Relays. Each SPM-4Relay has 4 isolated channels to help you manage devices more conveniently.Max. 20A/Gang: Each channel can support maximum current of 20A, no fear of high power load.Overload protection: Once the overload protection is enabled, it can protect your devices from burning out.Micro SD: SD card plays a more significant role, like export electricity consumption data quickly, store more than 20 years of historical electricity consumption and each meter relay can save 20,000 operation logs.Power metering: Obtaining current, voltage, and power easily. You can monitor the consumption statistics of 4-Relay by checking eWeLink App on your mobile phone.Sonoffs Smart Stackable Power Meter (SPM) is a professional category, DIN-rail compatible, stackable relay with a power meter and overload protection, with up to 20A per channel max. capacity. It can save consumption to a memory card (not an accessory).