SONOFF BasicR4 Review

If you've ever wanted to make a dumb light switch smart without rewiring your entire home, the SONOFF BasicR4 is probably already on your radar. It's a compact Wi-Fi relay switch that hides inside your existing wiring and lets you control connected devices remotely — lights, fans, appliances — through the eWeLink app or voice assistants. Simple premise, and for most people, it delivers.

What It Does Well

The BasicR4's headline spec is its 2400W maximum load at 240V, which covers the vast majority of household appliances. At 120V the rating drops to 1200W, so it handles standard lighting and most non-heating loads without breaking a sweat. Setup through the eWeLink app is genuinely painless — the kind of thing you do once and forget about.

One feature that's been getting attention in the smart home community is the Magic Switch Mode, which lets you replicate certain automation behaviors using a standard wall switch connected to the BasicR4. A thread on r/homeassistant specifically explored how to replicate this behavior with Zigbee devices, which is a backhanded compliment — people like the concept enough to want it elsewhere.

For eWeLink and Alexa/Google Home ecosystems, the BasicR4 slots in cleanly. Schedules, timers, remote on/off — all there, all functional.

The Load Limit Question — Read This Before Buying

Here's the thing that tripped up at least one real-world user: a discussion on r/LinusTechTips showed someone evaluating the BasicR4 for a 1500W LED lighting installation and questioning whether the 2400W@240V rating actually applies to LED loads, or whether it's primarily rated for resistive loads like kettles and heaters. That's a fair and important distinction.

In practice, the BasicR4 should handle LED loads fine within its rated wattage — LEDs are far gentler on relays than inductive or resistive loads. But if you're wiring up something at the upper end of the spec, especially with commercial or industrial lighting, it's worth double-checking your load type and consulting an electrician. The community response to that thread was clear: for very high loads, running the BasicR4 as a control switch for a dedicated contactor or relay is the safer, more professional approach.

The Elephant in the Room: Wi-Fi Only, No Zigbee

The BasicR4 is a Wi-Fi device. That's fine for most users, but if you're building a Zigbee or Z-Wave mesh ecosystem — as many Home Assistant users are — this won't integrate natively. The LTT thread specifically flagged this when looking for Z-Wave/Zigbee options, with Shelly's Gen4 line coming up as an alternative that supports Wi-Fi, Bluetooth, and Zigbee. If protocol flexibility matters to you, the BasicR4 is a harder sell. It also requires a neutral wire in most standard wiring configurations, which can be a dealbreaker in older homes.

Who Should Buy This

• DIY smart home beginners who want app and voice control without spending much — this is a strong entry point
• eWeLink ecosystem users already invested in SONOFF products
• Anyone controlling standard loads — lights, fans, small appliances under 2400W at 240V

Who should look elsewhere: Home Assistant power users wanting Zigbee integration, those with no neutral wire, or anyone looking to switch heavy commercial LED rigs without additional relay hardware.

The Competition

Shelly's 1PM Gen4 comes up repeatedly in community discussions as a step-up alternative — it supports Wi-Fi, Bluetooth, and Zigbee, offers up to 16A/3.5kW, and has a DIN rail mounting option. It costs more, but if you need protocol flexibility or higher load ratings, it's the switch enthusiasts point to. For pure eWeLink simplicity at a budget price, the BasicR4 holds its ground.

Frequently Asked Questions

Q: Does the SONOFF BasicR4 work with Home Assistant?

A: Yes, via the eWeLink integration or by flashing custom firmware like Tasmota. Out of the box it uses SONOFF's cloud, but local control is achievable for advanced users.

Q: Can the BasicR4 handle LED lights?

A: Yes, LED loads are well within its rating. The 2400W@240V spec covers standard residential LED lighting comfortably, though for very large commercial installations, pairing it with a dedicated relay/contactor is recommended.

Q: Does the BasicR4 need a neutral wire?

A: Yes, it requires a neutral wire. This can be a limitation in older homes where neutral wires are not present at the switch box.

Q: How does the BasicR4 compare to Shelly switches?

A: The BasicR4 is simpler and typically cheaper, and works well within the eWeLink ecosystem. Shelly's Gen4 line offers higher load ratings, Zigbee support, and broader smart home protocol compatibility — making it the better pick for advanced Home Assistant setups.

Q: What is SONOFF Magic Switch Mode on the BasicR4?

A: Magic Switch Mode allows a conventional wall switch wired to the BasicR4 to trigger automations and scenes, rather than just toggling the relay. It's a useful feature for blending smart and traditional switch behavior without replacing your wall switch panel.

— Home Lead Editor 1, CPrice