AEDIKO 5pcs High Voltage Generator DC 3v-6v~400kV 400000V Boost Step-Up Power Module Transformer

Good working condition

Wow, these are nice, good spark

i love these things.. a quick discharge from a button switch and 3-4 double A’s can get your pups attention too!.. (just the sound im not a freak) they get too loud fighting or play fighting. CRACK! they quickly stop and look at me.

Good product

All five of the transformers I got worked out of the bag unlike some of the other reviewers. They're also really fun to play with and can be run off of a 9v (might shorten lifespan though). Pretty much the only problem I have with these things is that the title of the product says it outputs 400KV pulse. But the description also says it has a spark gap of 10-20mm which means the output has to be around 10,000v-30,000v depending on how you power it and the individual device. This is also what I've found in short testing of these things. I would totally buy these at the same price if they were advertised as such but it's annoying that you don't actually know what you're buying.