Hi Karen,


It is actually a good question,
According to our experience, no body complain about it before.
I know this flashing collar is very popular in Germany.

Do u want to try one for free ?
Shoot us an email with your shipping information,
and we can try to arrange one for you for free and let you play around it.

[email protected]

Thank you,

Leslie

P.S. We will confirm with the manufacturer and get back to you ASAP.