Citizen CB5006-02L Promaster Sky Radio Controlled Watch The Citizen CB5006-02L Promaster Sky Radio Controlled watch is a men's watch with a radio-controlled movement that receives a signal from the atomic clock. As a result, this movement runs so accurately that the deviation is no more than 1 second per 1 million years. In addition, this Citizen Promaster watch is also equipped with sapphire glass and it is waterproof up to 200 meters. The cabinet diameter of this model is 46 mm, which is slightly larger than average. This Citizen is extremely modern in terms of functions and quality is more than excellent. + Eco-Drive with 3 years of darkness reserve+ World time+ Eternal calendar Citizen Eco-Drive movement The Citizen CB5006-02L Radio Controlled has a modern Eco-Drive movement that is powered by a light-sensitive cell. You do not have to replace the battery with this model. Once fully charged, it has enough energy for 300 days. PCAT watch: very