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Cannondale's philosophy is to integrate products functionally as well as visually. The Si Stemlight is a high-performance 3W Li/Ion LED battery light integrated in the stem clamp, using the space inside the stem for battery storage. The cable from the battery to the light goes via a reducer that brings the stem clamp diameter down from 31.8 to 25.4mm. There is a charging port on the light unit to recharge the battery. The light has 3 modes (Full power, Save and Flash). Capacity in Full Power mode is minimum 2,5 h. The light unit can be adjusted to fit stems from -5 to +20 degrees. Weight: appr. 140 g.