Pawtitas Glow in The Dark Cat Collar Safety Buckle Removable Bell Cat Collar Kitten Collar Teal Cat Collar, One Size

What is the smallest this collar adjusts to?

Does it come off very easily? I've tried to keep a collar on my cat but she always gets them off and loses them. I'm tempted to try the old fashioned

Does it protect birds?

Do all of the designs glow the same color?