Ready, Set, Dive. Take your timepiece to new depths wearing the… Promaster Professional Diver 1000M. This brand new dive watch from Citizen contains all the necessities for an avid diver. Featured with black polyurethane strap, Super Titanium™ case with black dial, ISO compliant, helium release valve, power reserve indicator and one-way rotating elapsed time bezel with lock. Featuring our Eco-Drive technology – powered by light, any light. Never needs a battery. Caliber number J210.