30W Universal AC/DC Power Supply 30W Adaptor Plug Charger Adaptor 6 Straight Plug Output voltage DC 3, 4.5, 5, 6, 7.5, 9, 12V

30W at 12V -> possible [2.5 Amps]But 30W at 3V -> That would be 10 Amps - and the wire wouldn't cope with that current.So if using at lower than 12V - don't expect anywhere near 30W out of it, I'm guessing it's managing about 7.5W at 3V output - two D sized batteries will provide more.

These PSUs are absolutely great if your device is "pin positive" - however unlike some other designs, you cannot "flip the tip" because the tip has 2 different sized pins, meaning it can only be used pin positive! You could ultimately cut the cord, reverse the wires and reconnect if you have the requisite skills - but that will of course invalidate any warranty and cannot officially be recommended as it may be unsafe if done incorrectly.

First line of description says 'tip negative effects pedals', but buried at the bottom of the notes it says ''NOTE: DC Plug Polarity: inner Positive(+), outer Negative(-) , polarity is irreversible. Please check the polarity before you buy this adapter". Certainly wasted my money.

Although a reasonable price for this multi adapter mains 240v to various D C voltages I needed it to replace a missing power supply for a Robert DAB radio I have had to return. Unfortunately the male connectors proved very flimsy and pulled out of its plastic casing.

Needed a charger for our drill and it does the job.

I brought this adapter for my daughters keyboard, but it didn’t work for some reason but I kept it and used it for other things and it works fine

Excellent allows me to power my dac box so i can use my Dac box with my sky q

Best thing I've bought in a long time, had 3 different items that needed charging fitted them all ! Wish I'd bought this sooner!!definitely recommend!