This G-SHOCK Mudmaster GWGB1000-1A, a part of the G-SHOCK Master of G line, was constructed for professionals who work in the harshest environments, facing the severity of the elements. This timepiece designed to be tougher, keeping functionality at the top of the list. With the ability to operate with ease in extreme environments this MUDMASTER has earnt the respect and appreciation of rangers and rescue team professionals. - 58.7 × 52.1 × 16.2mm Case Size - 114g Weight - Resin (Bio-based)/Stainless steel Case and Bezel - Bio-based Resin Band - Shock Resistant - Vibration resistant - Mud Resistant - Carbon Core Guard structure - 200 Meters Water Resistant - Radio-controlled Watch; Multi band 6 - Power supply and battery life - Tough Solar (Solar powered) Sensor Feature: - Compass function - Bearing memory function. Automatic horizontal, magnetic declination, and orientation correction function. - Barometric pressure measurement function. - The pressure trend graph can be changed to measurement every 30 minutes. That's for the last 5 hours. - Altitude measurement function/relative altimeter - Temperature measurement function - Smartphone Link/App Connectivity Features: Mobile link (Wireless linking using Bluetooth®) - Sapphire crystal with anti-reflective coating - Screw Lock Crown Watch Features: - World time: 38 time zones (55 cities + coordinated universal time) - Stopwatch - Timer - Alarm/hourly time signal - Double LED light - LED: White - Calendar: Full auto-calendar (to year 2099) - Mute feature: Button operation tone on/off - Energy saving feature - Approx. battery operating time:6 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) - Accuracy: ±15 seconds per month