Does this work on 5v like usb cables etc

USB cables plugged into a wall socket yes, but n9t cables plugged into my Laptop.

Can this be used to detect wires in wall before drilling screws for hanging picture frames?

From my brief experience with the tool it is capable of detecting live wires from a distance, certainly on the higher settings. I am unsure how deep it would be able to detect and how accurate it may be. Plus it won't pick up pipes, studwork etc... like a good stud finder would, but if you have plenty of space to work with and a rough idea what's already behind the wall, it may be sufficient.

What setting do I need to detect 240v cable behind plasterboard (I don't understand the gear chart above)?

The most sensitive and powerful setting is 9 - this will go through quite thick walls. The lower settings are to identify individual live wires. If you use 9, it will pick up any power behind plasterboard.

Manufacturer	HANMATEK
Part Number	AC1
Product Dimensions	12.9 x 2 x 2.9 cm; 60 g
Batteries	2 AAA batteries required.
Item model number	AC1
Colour	AC1 Voltage Detector
Style	AC1 Voltage Detector
Power Source	Battery Powered
Item Package Quantity	1
Certification	CE
Batteries included?	No
Batteries Required?	No
Battery Cell Type	Alkaline
Item Weight	60 g

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