>>1715501I would say shoot for a holy trainer v2 esque knock off. (I haven't seen a v3 knock off yet.) You can find them on dhgate/aliexpress for like $10-30 and they come with multiple ring sizes. The holy trainer series are a bit... harder to stay clean with I will warn. But I like to consider them beginner friendly and easy to assemble, I also love the ring shape. It also doesn't have a clacking sound due to an internal lock.
Now if you wanted to go easier to stay clean, a metal one can work well with a more open design. I would avoid any with a urethra insert. There are still several (again dhgate or aliexpress. Just do a search for male chastity.) that have integrated locks, in fact it seems a general trend to go towards that style of locking now. The downside for me is ring shape definitely is a harsher tug on the nads when asleep or dry.
Avoid anything with a hinged ring, and honestly anything with spikes/points of intrigue. Urethral inserts at least from my experience aren't great with the knock off units.
Things to note:
You will wake up at night. Guaranteed. Typically I recommend pissing to resolve the discomfort.
You will have uncomfortable tugging on your sack. A clean shave and oil/lotion will help. (I've heard baby oil, coconut oil.. personally I use lotion.)
Seriously. A clean shave at least around where the ring will lay.
You will probably want to sit down to piss until you get used to adjusting while standing. Unless you want to have to explain why your pants got wet and you painted the wall.
For some this is definitely a 24/7 thing. I know my goal would be to hit 3 months locked.