These G-SHOCK Master of G quot;GRAVITYMASTERquot; GR-B200 models pack flight mission essential functions into a tough and rugged carbon core guard structure.A high-strength, highly weather-resistant carbon core guard structure protects the module with a resin case reinforced with carbon fibers. This, combined with world-renowned G-SHOCK shock resistance, creates a structure that is also highly vibration resistant.The bezel is made up of three layers of resin with carbon fiber inserts. The top layer is semi-transparent to reveal the carbon material inside. The three buttons on the right side of the watch are arranged in a way that makes them resemble a helicopter control stick, while also contributing to ease of operation.The Quad Sensor system of these models uses compact sensors that make it possible to pack compass, altitude/barometer, and temperature measurement capabilities, along with an accelerometer that keeps track of your step count, into a compact configuration.