For the person that stays in too many hotels and timezones. Never get caught short without a do nto disturb sign and avoid those rude awakenings. This credit card sized Do Not Disturb sign is ideal to slip into the lock on the outside of your hotel room ensuring that house keeping won't miss your wishes for a bit of piece and quite.
Keep it in your wallet for travel on on your keys or luggage but make sure you always have the rest you need.