A mid-size design that's optimal for running and training, bluetooth®, phone app linking and more makes the gba800 the perfect choice for everyday wear and fitness training. The g-shock connected phone app allows you to configure settings for a step count log with five exercise intensity levels, calorie calculations, and step targets. Other features include app-based auto time setting correction and an auto double led light to facilitate workouts in areas where lighting is dim. The 49mm case is crafted of stainless steel and green resin. The green resin band secures with a buckle clasp.