SONOFF
SONOFF 4CHPROR3
Smart relay switchWi-Fi
$26.21Listed equipment price · lowest price out of stockListing observed 2026-11-07
SONOFF
SONOFF SPM-Main Stackable Power Meter Controller
Energy monitor controllerWi-Fi / Ethernet / RS-485
Retailer listing · 1 offer collected
ITEAD / SONOFF$29.90
Listed equipment price
In stock when checkedView retailer offer Price observation: 2026-11-07 · USDSHOP THE SAME EQUIPMENT
Compare retailer prices.
One exact price collected
1 retailer · 1 offer collected. Prices exclude shipping, tax, and installation. Compare the stock, condition, and date for each offer.
| Retailer | Listed price & quantity | Availability & condition | Observed | Shop |
|---|---|---|---|---|
| ITEAD / SONOFFStore policies & support | $29.90Single item | In stock when checkedNew | Source date 2026-11-07 | View offer |
WHAT WE ACTUALLY OBSERVED
Prices have a history.
Observations keep their original source dates and purchase scopes. Historical lows are separate from current availability. Unpriced and configuration-dependent offers are never treated as exact-price lows.
ITEAD / SONOFF · Single item · price & stock history
Open to load this exact offer’s dated source observations.
Standards evidence.
No exact-model certification record has been reviewed for this listing in our evidence collection. This does not establish whether the product is certified.
How to verify the model and scopeTHE DETAILS THAT MATTER
A clearer look at the specifications.
| Specification | Listed value | Source |
|---|---|---|
| Device function | Energy monitor controller | Manufacturer documentationReviewed 2026-11-07 |
| Device communication protocols | Wi-Fi / Ethernet / RS-485 | Manufacturer documentationReviewed 2026-11-07 |
| Stated compatible equipment | SPM-4Relays | Manufacturer documentationReviewed 2026-11-07 |
| Energy measurement method | Collects measurements from separate SPM-4Relays modules; not a standalone measurement channel. | Manufacturer documentationReviewed 2026-11-07 |
| Controller / hub requirements | SPM-Main controller only. Separate SPM-4Relays required; main supports up to32 modules per source. | Manufacturer documentationReviewed 2026-11-07 |
| Documented local functions | YesManufacturer documents local SD energy history retrieval through HTTPAPI. This describes local data access, not all remote functions. | Manufacturer documentationReviewed 2026-11-07 |
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