In an electric screwdriver 3.6 volts, which is why I bought it because I lost its charger, it didn't work. I tried it at all voltages up to 6 and with both polarities, but nothing. I will come back when I try it on something else if it charges. Also, in the package, it had 3 plugs and not 6 as it says

Very good, very decent for universal, definitely Value for Money. Just because of the nature of the product, it requires attention with the volts and the complexity!

Very good for its price, works perfectly but don't expect perfect quality in the materials, it requires some attention during use.