Hello Mistress Kang, it's an honor to hear from you!
We love this toy, even more than the Tazapper and the Erostek-ET323 (with all its attachments).
Regarding fit: it comes with a black faux patent cuff with a good range of sizes (worked equally well on my thigh, neck, balls). Alternatively, there's a guy selling a leather collar that works with it. Could send pix next week.
Re: Voltage: it seems to have a good range, from a mild tingle, to "oh god, please don't do that again!" for me.