There are already plenty of decent UVC sanitizers on the market that can kill 99.9% of dangerous bacteria and viruses on your everyday items. The CASEWASH UV-C Sanitizing Pen is also worth a look. It is a compact little gadget that can sanitize your watch, AirPods, iPhone, and everything in between.
This UVC Pen has a built-in safety feature that requires a double tap to turn on. It automatically turns off when you hold the pen facing upwards. It lasts up to 4 hours on battery with 10-30sec cycles.[where to get it]