Measurements 43 x 43 x 8.5 mm Weight 35 g with wristband, 21 g without wristband. Display Gesture-activated color touch display (IPS TFT) with ambient light sensor (ALS). Always-on option in training mode. Resolution 240x204. Dragontrail glass lens. Battery 165 mAh Li-pol battery. Battery life up to 17 h in training mode (GPS and wrist-based heart rate), up to 5 days in watch mode with continuous heart rate tracking. Materials Glass fiber reinforced polymer case. Stainless steel bezel & button. Wristbands Black & Silver: TPU plastic, stainless steel buckle.