This set is super impressive considering the shock is coming from 2 batteries. The power supply is compatible with pads and other attachments, it's also a silent device. This is the perfect intro to e-stim. The only real problem is that this doesn't come with instructions so you really have to just push buttons to figure the remote out. The modes seems endless, you're gonna think you've hit the limit of what it can do and it's going so get so much better/worse when you least expect it. I thought I used it at full power the first time, so I let my guard down on my second try. I don't know if I suddenly hit a crazy mode, or the auto feature maxed out the intensity outta nowhere, but this thing kicked my ass. The difference between the high settings I thought were surely near max and what this thing decided to surprise me with was incredible. I lost the remote as it unleashed hell on me and now fully understand why the remote has a wrist strap. Ow. Awesome. The blast button appears to do absolutely nothing which is sad, but maybe I'm missing something. Unpredictability might be off putting for some but I think that's a plus, just don't lose the remote and always be ready to slam the off button as you're exploring the modes.