Sonoff Basic R4: A Smarter, More Capable Upgrade

The Sonoff Basic R4 is a worthy successor to the popular Sonoff Basic R2, bringing not only the essential smart switch functions you'd expect but also several useful enhancements. Like its predecessor, the R4 supports scheduling, inching, and remote control via the eWeLink app. However, it takes things further with a faster processor and new advanced features.

Key Features and Improvements

🔁 Magic Switch Mode
Create a two-way switch setup without additional wiring. Using at least one double-pole rocker switch, you can wire the R4 in series with standard switches to toggle your lights or appliances on and off. This is ideal for retrofitting without having to modify existing switch circuits extensively.

🌡️ Auxiliary Overheating Protection
The R4 includes a built-in temperature sensor that monitors real-time internal heat. If excessive temperatures are detected, it automatically intervenes to prevent damage such as deformation, melting, or fire, ensuring a higher level of electrical safety. It carries standard certifications like CE, FCC, and the more rigorous ETL certification.

📡 "eWeLink-Remote" Control
The Basic R4 supports the new eWeLink-Remote protocol, allowing you to pair it with S-Mate2 or R5 for local and two-way control through preset scenes — even without internet access.

Value and Compatibility

Among Sonoff's lineup, the Basic R4 is the most affordable model that offers Magic Switch Mode, making it a cost-effective choice for smart home upgrades that require two-way switching functionality.

It is important to note that the Basic R4 is rated for a maximum load of 10A. While this is sufficient for most small appliances — and many kettles (though you should always check the rating of your specific appliance) — it is not suitable for high-powered devices such as geysers or large heaters. The Basic R4 is best used with low to medium-power appliances.

Usage Considerations

• Power Rating: The Basic R4 is rated for a maximum load of 10A. This makes it suitable for low- to medium-power appliances, such as lights, fans, and many kettles (check your specific appliance's rating). It should not be used with high-powered devices like geysers, space heaters, or large kitchen appliances.

• Installation Space: The unit's compact but bulky form factor may pose challenges when fitting it into tight spaces or small electrical boxes.

• Indoor Use Only: The Basic R4 is not weatherproof and must be housed in a certified waterproof enclosure if used outdoors.

Ideal Purpose

• Testing & sandbox environments
• Remotely controlling devices that run mostly on schedules (minimal daily interaction)
• Small swimming pool pumps
• Garden irrigation systems (Remember the R4 is not weatherproof)
• Seasonal lighting (e.g. holiday lights)
• Exhaust fans or bathroom fans
• Aquarium pumps or lighting
• Garage or shed lights (non-critical, low-power)

Online support documentation

Documentation and support can be found at Sonoff online documents

The Sonoff Basic R2 is an excellent entry point for anyone beginning their home automation journey. While it is a basic switch, it delivers all the essential connected features you would expect — including scheduling, inching, and remote control via the eWeLink app. It is also the most affordable smart switch in the Sonoff range, making it an attractive option for those looking to experiment without a large upfront investment.

However, it’s important to note that the Basic R2 is rated for a maximum load of 10A. While this is sufficient for most small appliances — and many kettles (though you should always check the rating of your specific appliance) — it is not suitable for high-powered devices such as geysers or large heaters. The Basic R2 is best used with low to medium-power appliances.

Another thing to keep in mind is its physical size—about the size of two matchboxes. That’s compact enough for many setups, but it can be a bit tricky to fit into tight spaces or smaller electrical boxes.

Also, while it gets the job done for basic automation, it doesn’t include some of the advanced features you’ll find in higher-end Sonoff models. For example, the Sonoff Mini R4 offers extras like “magic switch” functionality and support for external triggers—handy if you need more flexibility.

In short, if you need a simple, affordable way to bring automation to basic appliances, the Sonoff Basic R2 is a great choice — just be mindful of its limitations.

Ideal Purpose

• Testing & sandbox environments
• Remotely controlling devices that run mostly on schedules (minimal daily interaction)
• Small swimming pool pumps
• Garden irrigation systems (Remember the S2 is not weatherproof)
• Seasonal lighting (e.g. holiday lights)
• Exhaust fans or bathroom fans
• Aquarium pumps or lighting
• Garage or shed lights (non-critical, low-power)