Woot has listed this product 3 times over time.
SONOFF Smart Stackable Power Meter
$41.27
Deal ends Aug 15, 2026
About This Deal
SONOFF Smart Stackable Power Meter (4-Relays)【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.【Power metering】You can monitor the power consumption by checking eWeLink App on your mobile phone. Obtaining current, voltage and power easily.【Max. 20A/Gang】Each channel can support maximum current of 20A, no fear of high power load.【Communicated by RS-485】The SPM-Main communicates with the SPM-4Relays through RS-485, which allows for multi-terminal and stable long-distance data transmission.【Overload Protection】Once the overload protection is enabled, it can protect your devices from burning out.Shipping Note: Shipping to Alaska, Hawaii, PO Boxes, and APO addresses is not available for this item Warranty: 90 Day Woot Limited Warranty
Key Features
- ✓ 【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.
- ✓ 【Power metering】You can monitor the power consumption by checking eWeLink App on your mobile phone. Obtaining current, voltage and power easily.
- ✓ 【Max. 20A/Gang】Each channel can support maximum current of 20A, no fear of high power load.
- ✓ 【Communicated by RS-485】The SPM-Main communicates with the SPM-4Relays through RS-485, which allows for multi-terminal and stable long-distance data transmission.
- ✓ 【Overload Protection】Once the overload protection is enabled, it can protect your devices from burning out.
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Technical Specifications
- (1) SONOFF Smart Stackable Power Meter
Purchase Limit: 10 per customer
Shipping Information
Standard Shipping
Not available in: AK, HI, AA, AE, AP, AS, FM, GU, MH, MP, PW, PR, VI
PO Box shipping not available
Two-Day Shipping
Not available in: AK, HI, AA, AE, AP, AS, FM, GU, MH, MP, PW, PR, VI
PO Box shipping not available
One-Day Shipping
Not available in: AK, HI, AA, AE, AP, AS, FM, GU, MH, MP, PW, PR, VI
PO Box shipping not available