Dive Computer Crest CR4 with Bluetooth Support Modes Scuba Diving, Free Diving, Instrumentation Functional Characteristics Rechargeable Battery Resettable Residual Nitrogen Resettable Settings and Dive Logs Fast-Charging Mode (Up to 85% in 1 hour) Medical Grade Silicon Wrist Bands 22mm Standard Wrist Strap (Can be replaced with 3rd party Watch Straps) 316 Stainless Steel Metal Parts for Weather Resistance and Rustproof