A very disappointing detector regarding electrical wires (it doesn't beep even above the socket or the switch), it easily finds metal inside poles, I haven't tested it for wood. I bought a Chinese one from Aliexpress (KAIWEETS-KES 01) and it finds the wires inside the wall.

For the cost, very good, I used it to locate wires which it detected with relative accuracy, even when there was no current flowing.

It shows a pretty good machine for detecting metal pipes (iron, copper) in the ground that I bought it for. For this reason alone!!
As for the power, it is not completely reliable, not at all, as others have written. It detects elsewhere (e.g. supply from a clock) and not at all for cables inside the wall, even though there are cables with power passing through those areas. Look for another one for detecting embedded cables and power!!

Pretty good accuracy, but not flawless. A bit pricey for what it offers, but I wouldn't change it under any circumstances.

It will help you avoid nails in the wall, but it will struggle in the corners. Maybe I'm not using it correctly, I don't know. Anyway, I don't know of anything better for this price.

Unfortunately, I wasted my money! It can hardly catch cables at all! Not even when they are loaded. Don't buy it! I will check if it's still under warranty to return it.

update: The problem is severe when the cable is deep. It finds them more easily on the surface.

It is not reliable, it cannot accurately detect power cables even at a depth of 2-3 cm from the external side of the walls

Very good and useful tool. I haven't worked with it much, but so far I am very satisfied.

Good, it has helped me many times for cable detection, it makes some mistakes but in combination with another one I have from a different company, which is more affordable, I find results overall very good, but if it was more affordable it would be perfect

100% it is not expensive (although it is much ahead of other similar ones in its category), but it is in a very high percentage and if you find it around €80 or lower in some offer, get it.

Easy and convenient product to use and read the indications. It is quite good at finding metallic elements on walls, but only if they are isolated. In the case of wanting to measure on reinforced concrete or beams, it gets confused and often gives incorrect readings, making it practically useless. Its effectiveness on drywall was good, but keep in mind that these devices need to detect current flowing through the cables to find them. If there is no current, they won't detect anything.
It has good features and if it cost 15-20 euros, it would be okay. At 70+, it is completely impractical and I cannot recommend it to anyone.

It finds cables under voltage and metals with fairly accuracy, but it deviates about 3 cm parallel to the current conductor. Good build quality.

TEST/REVIEW:
https://youtu.be/taBP7nCDDc4

In metal, with calibration, it performs decently, although with some minor flaws.
It does not reach a great depth.
In the electrical conductor, it performs poorly. It only achieves accuracy when parallel to the conductor. Accuracy across the conductor is as if it has the eye 2-3 points higher. Caution!

Extremely useful tool. Although it is somewhat difficult to use initially, it proves to be very reliable once you learn it.