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Details Crest CR-4 Dive Watch The Crest CR-4 is a great yet small dive watch that features 3 dive modes, Diving (air or nitrox), Freediving, and Gauge. These modes and their respective user settings are changeable on the computer itself or the handy phone app which also serves as a logbook. With a backlit display and a relatively modest form factor this is bound to become a very popular choice for the avid recreational diver! Features 3 Modes: Freediving, Diving & Gauge Rechargeable Lithium-ion battery 300 charge cycle Fast charging (up to 85% in 1hr) Residual Nitrogen Time resettable Dive settings and logs resettable Bluetooth connectivity to phone app CREST CR-4 Spec Operating Depth Limit 100 meters / 330 feet MultipleModes Scuba, Gauge, Apnea Mode Air and Nitrox Oxygen 21%~56% Algorithm Buhlmann ZH-L16C Safety Factor Conservative, Normal, Aggressive Battery Type Rechargeable Battery (300 charge cycle) Battery Life (Dive Mode) 25 dives with backlight on Battery Life (Standby mode) up to 3 months Dive Log storage 900 Screen resolution 110 x 110 PIXEL Display size 2.9cm / 1.14 Weight 95g5g Bezeland Button 316 stainless steel Lens K1 tempered glass Straps 22MM anti-allergic silicone Temperature Displayed 0C ~ 40C (32F ~ 104F) Operating Temperature -5C ~ 40C (23F ~ 104F)