SONOFF
SONOFF 4CHPROR3
Smart relay switchWi-Fi
$26.21Listed equipment price · lowest price out of stockListing observed 2026-11-07
SwitchBot
SwitchBot Contact Sensor
Door / window contact sensorBluetooth
Retailer listing · 1 offer collected
SwitchBot US$16.99
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 |
|---|---|---|---|---|
| SwitchBot USStore policies & support | $16.99Single 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.
SwitchBot US · 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 | Door / window contact sensor | Manufacturer documentationReviewed 2026-11-07 |
| Home Assistant support and conditions | YesOfficial Bluetooth integration lists this model/family. Requires a compatible Bluetooth adapter/proxy and setup; encrypted models may require keys/account setup. Scoped to documented functions, not every app/cloud feature. | Official integration documentationReviewed 2026-11-07 |
| Documented local functions | YesScoped to documented Home Assistant Bluetooth functions; host/proxy and initial setup are required. Does not establish that every feature operates offline. | Official integration documentationReviewed 2026-11-07 |
| Device communication protocols | BluetoothProtocol families explicitly described by the manufacturer or official integration; Matter bridging conditions are recorded separately. | Manufacturer documentationReviewed 2026-11-07 |
| Documented platform integrations | Amazon Alexa / Home AssistantIntegration routes and features vary; referenced SwitchBot hubs / Matter controllers may be required. This is not a certification badge. | Manufacturer documentationReviewed 2026-11-07 |
| Door / window contact sensing | Yes | Manufacturer documentationReviewed 2026-11-07 |
KEEP EXPLORING
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