Citizen invented the Eco-Drive. Watches that don’t require batteries and work using the energy from natural and artificial light. Thanks to this technology Citizen watches don’t need batteries, therefore never need to be opened. This guarantees that the watch is completely waterproof. Citizen watches are the preferred watches of deepsea divers. Citizen was awarded make of the year in 2007 for its’ continuous effort in applying the latest technology to its’ watches.