Flashed smart switch for Home Assistant: our review (10/10)

Who it's for

This review is aimed at people shopping a Behogan product in the maison-connectee category who want real-world use, not a brochure. If Fits behind the existing switch, no change to your decor matches your need, you're in the audience. If Requires a neutral wire (check your wiring) is a dealbreaker, walk away early — we'd rather say so upfront.

Below: daily use, useful numbers, then a two-week follow-up to separate day-one wow from what actually sticks.

What if your ordinary wall switch became smart without changing your decor or rewiring anything? That's exactly what the Behogan Wi-Fi switch module does: a tiny receiver that sits behind your existing switch and turns it into a smart switch. We tested it, then flashed it for local Home Assistant integration. Verdict: 10/10.

A module that hides behind the switch

The idea is simple: the module (barely bigger than a matchbox) connects behind your existing switch. You keep your look, and the switch becomes remotely controllable. On the wiring side, it's straightforward:

• 100–240 V AC power supply;
• 16 A max (3,840 W) — more than enough for lighting;
• a neutral wire is required (check before you buy).

The pack includes 2 modules — enough to equip two rooms for around €28.

The real plus: flashable over USB-TTL for Home Assistant

Where this module stands out is that it can be flashed with a simple USB-TTL adapter (like the Helweet CP2102 at ~€9). Once flashed, it connects directly to Home Assistant, locally, without going through the Tuya cloud — and crucially with state feedback: Home Assistant always knows whether the light is on, even when you flip the switch by hand.

For the less DIY-minded, the module also works out of the box with the Tuya / Smart Life app (remote control, schedules, scenes, Alexa and Google Home).

Our verdict

For automating existing lighting on a budget, this Behogan module is a great entry point: simple install behind the switch, state feedback, and the option of 100% local Home Assistant integration via a USB-TTL flash. The perfect score is earned — provided you have a neutral wire and don't mind a bit of tinkering.

🛒 See the Behogan module on Amazon · See the CP2102 adapter on Amazon

A great entry point for automating existing lighting: a Wi-Fi module at ~€14 a unit, flashable over USB-TTL for 100% local Home Assistant integration with state feedback. Plan f…

Spec	Value
Brand	Behogan
Type	1-way Wi-Fi switch module
Power supply	100–240 V AC
Max current	16 A (3,840 W)
Connectivity	Wi-Fi (Tuya / Smart Life)
Compatible with	Alexa, Google Home, Smart Life, Tuya
Installation	Behind the existing switch (neutral required)
In the box	2 Wi-Fi receiver modules

Criterion	Score
Ease of use	10/10
Value	10/10
Caveats	8/10
Rocks overall	10/10

Strengths and trade-offs

What actually sticks: Fits behind the existing switch, no change to your decor ; Flashable over USB-TTL for 100% local Home Assistant integration ; State feedback: Home Assistant always knows whether the light is on ; 16 A / 3,840 W — more than enough for lighting.

What you have to live with: Requires a neutral wire (check your wiring) ; Flashing needs a USB-TTL adapter and some tinkering ; Generic brand: limited warranty and support. These aren't hidden footnotes — know them before you buy.

We're not hunting a perfect product: we're hunting the right compromise for a specific use. The lists above exist for that.

After 2 weeks of use

After fifteen days of real use — not just an unboxing — the feel still matches our verdict: A great entry point for automating existing lighting: a Wi-Fi module at ~€14 a unit, flashable over USB-TTL for 100% local Home Assistant integration with state feedback. Plan for a neutral wire and a CP2102 adapter. The first days are mostly habit-building (settings, apps, fitting it into the routine). By week two you know what you actually use versus what you ignore.

Nothing contradicted the 10/10 score: the strengths above stay visible day to day, and the caveats didn't get worse with time. That's what we want in a Rocks review — an honest trajectory, not a 48-hour honeymoon.

If you're still unsure, ask the simple question: does the main benefit change your week, or is it just nice-to-have? If the former, it earns its place; if the latter, keep the budget.

Tips before you buy

Check compatibility with your current setup, Behogan support, and the live price when you read this (it moves fast). Re-read the caveats: if they hit your main use case, it's the wrong product — overall score aside.

Also budget the forgotten accessory (cable, adapter, mount). That detail often turns « almost » into a smooth daily driver.

Verdict

A great entry point for automating existing lighting: a Wi-Fi module at ~€14 a unit, flashable over USB-TTL for 100% local Home Assistant integration with state feedback. Plan for a neutral wire and a CP2102 adapter. Rocks score: 10/10.