How It Works

1
Unplug your sensor
Disconnect your existing temperature/moisture probe from the Sonoff TH switch by squeezing the RJ9 clip.
2
Plug in the extension
Insert one end of the cable into the TH switch's sensor port. It clicks in.
3
Plug the sensor into the other end
Connect your probe (THS01, WTS01, or MS01) to the far end of the cable. Done.
4
Place sensor where needed
Route the cable to your water heater, garden, or wherever the sensor needs to live. Use cable clips to keep it tidy.
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Is This Right for Me?

Length: 5 meters
Connector: RJ9 (4P4C) — both ends
Max cable length (THS01 / WTS01): 60 meters total
Max cable length (MS01): 10 meters total
Compatible with: Sonoff TH Elite, TH Origin
Compatible probes: THS01, WTS01, MS01
Installation: Plug-and-play, no tools
Power needed: None (passive cable)

Product Details

Sonoff Sensor Extension Cable (RJ9)

Need to place your sensor farther from the TH Elite or TH Origin? This 5-meter extension cable gives you the extra reach. It uses an RJ9 connector (like a phone cable) and works with all Sonoff TH-compatible sensors.

Key Features:

  • 5-Meter Length: Extends the distance between your sensor and the TH Elite/Origin.
  • Compatible Sensors: Works with the THS01 (temp & humidity), WTS01 (waterproof temp), and MS01 (soil moisture).
  • Max Extension: THS01 and WTS01 can be extended up to 60 meters. MS01 (soil moisture) up to 10 meters.
  • RJ9 Connector: Plug-and-play — just connect and it works.

💡 Pro Tip: If your water heater is in the bathroom but your electrical panel is in another room, use this cable to bridge the gap between the TH Elite and the waterproof temperature sensor.

What You Get

5 extra meters
Reach further from the wall switch to the appliance you're monitoring — water heater, garden, server rack, fridge.
Plug-and-play RJ9
Standard RJ9 connector on both ends. Just unplug the sensor from your TH switch, insert the cable, then re-plug the sensor.
Works with every Sonoff probe
Compatible with THS01 (temp + humidity), WTS01 (waterproof), MS01 (soil moisture) — same connector across the lineup.
Can chain longer
THS01 and WTS01 support up to 60 m total cable; MS01 up to 10 m. Add multiple extensions if needed.
Place sensors right
Water heater in the bathroom but switch panel in another room? This cable makes the install actually work.

Works With

Sonoff TH Elite
Works
Sonoff TH Origin
Works
Sonoff THS01 / WTS01 / MS01 probes
Works

Control with the eWeLink app

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eWeLink
Set up your Sonoff Sensor Extension Cable in minutes — voice control, scenes, automations, away mode.
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What's in the Box

1× Sonoff RJ9 extension cable (5 m)

Delivery & Pickup

Standard Delivery
All Lebanon governorates — Greater Beirut usually next day; Tripoli, Jbeil, Saida, Tyre, Zahle, Akkar and the rest within 2–4 working days.
$4 · Free over $50
Express Delivery
Faster shipping — usually within 24 hours of order confirmation (Greater Beirut & Metn). Same-day not guaranteed.
$6 flat
Pickup — Dekwaneh
Collect from our Dekwaneh store. Weekdays 10am–5pm, Sat 10am–1pm.
$3 · Free over $30

Warranty & Support

6-month Local Warranty
Covers defects in materials & workmanship. Handled here in Lebanon.
WhatsApp Support — Always On
Can't set it up? Message us. We reply within minutes, not days.
14-day Exchange
Exchange within 14-day for a product of equal or higher value. No refunds.
Free Setup Help
Every order includes a setup guide — plus a free WhatsApp call if you ever need a hand.

Customer Reviews (1)

5.0
★★★★★
1 review
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Smartio customer
July 2026
★★★★★
✓ Verified Purchase

Frequently Asked Questions

Will it work with my existing Sonoff sensor? ›
Yes — compatible with all Sonoff TH-compatible probes (THS01, WTS01, MS01) and all Sonoff TH switches (Elite, Origin). Same RJ9 connector across the lineup.
Can I chain multiple cables together for longer reach? ›
Yes — but mind the total-length limits. THS01 and WTS01 support up to 60 m total; MS01 caps at 10 m. Going beyond that may cause sensor errors.
Is installation difficult? ›
No — the RJ9 connector clicks into place like a phone or headset cable. Unplug your sensor from the TH switch, plug in the extension, plug the sensor into the other end. Done in 30 seconds.
Can I get it delivered quickly? ›
Most orders in Beirut ship same-day. Outside Beirut typically 1–2 days. Message us on WhatsApp for express options.
Will it survive EDL cuts? ›
It's a passive cable with no electronics — it doesn't care about power cuts. Once power returns, your TH switch and probe carry on as if nothing happened.
Can I run it through a wall? ›
Yes — the cable is thin enough to fit through standard conduit. If you're running it inside a wall, route it away from high-voltage AC wires to avoid interference.
Can I get a shorter or longer length? ›
We currently stock the 5 m version. For longer runs, chain multiple together (within the 60 m / 10 m limits) or contact us about bulk-order custom lengths.
Does it carry power to the sensor? ›
It carries the low-voltage signal between sensor and switch — the TH switch powers the probe through this cable. No separate power needed for the sensor.

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