Most plug-in detectors are either ugly or dumb. The gutong 5-in-1 is neither. It monitors smoke, carbon monoxide, combustible gas, temperature, and humidity from a single wall outlet. The front-facing HD screen shows live readings for each sensor, so you can see a slow gas leak or a rising CO level before the alarm triggers. That screen makes the difference between a passive device and one you actually check.

The alarm hits 100dB with a flashing light, which is loud enough to wake you from deep sleep. CO detection kicks in at 200ppm, and the gas sensor catches natural gas and propane leaks. The backup battery keeps it running during a power outage, which matters when a gas leak happens during a storm. The whole unit is compact and white, so it blends into a hallway or kitchen outlet without looking like a piece of safety equipment.

One practical note: this plugs directly into an AC outlet, so you lose that outlet. In a kitchen or utility room, that might be an issue. But having gas detection in the same unit as smoke and CO saves you from buying three separate devices. For the price, it covers more ground than any single detector has a right to.