Mystery snails are lovely gold snails, they can grow up to 4cm and will eat algae, dead plant matter and leftover food your shrimp or fish missed helping keep the aquarium clean. Unless your tank is massive however, you will likely have to feed them extra food. They may not get all their food just from the leftovers in the tank.
Recommended temperature range is between 21C to 26C. You usually do not need a heater for indoor tanks with them but will need one for out-door tanks.
The ones you get will be about 1-2cm in diameter.
Feel free to ask any questions here!
Mystery Snail sounded way cooler until I realised it was… just a snail.