This Coin Timer Box which is setup for US coins controls the time of power supply for electronic devices, such as, television, massage chair, kiosk system, car wash, water dispenser and washing machine based on the number of coins the user insert. Operator can program the time limit and the coin to time ratio(e.g. 1 dollar for 5 minutes) to fit their operation. The Timer Box equips with a LED digit display for showing remaining time and for operator to do setting. Besides, it has a self-contained coin box with lock for collecting coins.