Unlock your car by knocking a secret code on the window

The Knock-In Lock is a car add-on that unlocks your doors if you knock the correct combination of a five-to-twelve-digit knock code. It's intended for use in the event that you lock yourself out of your car.

# Estimated that nearly 1 million lockouts happen every year in Australia alone
# Highly secure, user defined, five to twelve digit AUDIBLE KNOCK code
# Shuts down for an hour with three wrong attempts
# Easily installed onto your existing central locking by auto electricians or car alarm installer with no drilling required
# No waiting around for hours for road rescue
# Avoid damage to your vehicle whilst breaking in to retreive keys
# 2 Year Manuacturers defects Warranty
# Extremely convenient to have even if you never get locked out
# Buy it NOW! Before You Desperately Need a Knock-In-Key!……

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(via Engadget)