Binary counters are used in simple timing operations. They can generate clock signals among many other less than complex operations.

When it shows up on the shopping channel

ticking over and getting a new no. like do the clock or some type of speedometer...

A clock radio can be purchased at many retail stores. Walmart, Target, Costco and Canadian Tire all carry various brands of clock radios which one can purchase. Amazon and eBay have many for sale as well.

TV, Car, Clock, and door.