From G-SHOCK, the watch brand that is constantly setting new standards for timekeeping toughness, come new colors for the G-STEEL lineup that combines different materials. The Bluetooth connect button, the GST-B100 iconic disk indicator at 9 o'clock, and the G-SHOCK logo are accented with colors that are typical of those seen on high-tech gadgets. The case has a black ion plated (IP) finish, which combines with the edgy GST-B100 design to create a pair of exciting new models. Case / bezel material: Resin / Stainless steel Resin Band Screw Lock Crown Neobrite Shock Resistant Mineral Glass Black ion plated bezel 200-meter water resistance Tough Solar (Solar powered) LED light (Super Illuminator) Afterglow Mobile link (Wireless linking using Bluetooth ) Dual time (Home city time swapping) 1-second stopwatch Measuring capacity: 23:59'59 Measuring mode: split time Countdown timer Measuring unit: 1 second Countdown range: 24 hours Countdown start time setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments) Daily alarm Battery level indicator Power Saving (hands stop to save power when the watch is left in the dark) Full auto-calendar (to year 2099) Date display Day indicator Regular timekeeping Analog: 3 hands (hour, minute (hand moves every 10 seconds), second), 3 dials (dual time hour and minute, dual time 24-hour, day) Accuracy: 15 seconds per month (with no mobile link function) Approx. battery operating time: 5 months on rechargeable battery (operation period with normal use without exposure to light after charge) 24 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge) Size of case : 58.1x53.8x14.1mm Total weight : 101g