Safety first kinky second.

If something is being locked into place on you and your expected to wear it about town and what not, make sure you can remove it just in case, or that the person with the key is physically present while it's being worn the whole time.

Chastity devices often have hard or semi- ridged parts that like rope and leather bindings when used incorrectly can result in unwanted damage ( such as when placed over boney protuberances or other regions where nerve damage could result); Even then if used correctly, one still needs to take into account that extremely long term conditions where not in the original design...so although it's properly applied and then additional pressure from some kinds of clothing or positions is added...some devices and bindings etc can end up digging into the skin real quick and or making a pressure ulcer in less than 20 minutes or cause irreparable nerve damage.