Not sure I’d swear by it!!

Purchased this for when my daughter has her annual Christmas party with all her uni buddies...saw it and thought it might be an idea to have it to make sure that none tried to leave and drive while over the limit 

I didn’t even know that things like this could be purchased and was rather keen to try it... it didn’t work brilliantly, I can’t lie, the alarm button did nothing and despite having 2 glasses of wine as a test it read a big fat zero? 

Its easy to use and is a great idea but purely for entertainment purposes as opposed to gambling your licence!