The Ion Pro RT front bike light lets you ride with confidence at any time of day. The USB-C rechargeable light features four modes for day and night. Ion Pro RT provides a powerful beam that lights up the full width of any road or trail, and the flash setting is daytime visible from up to 2km away. Its compact design and adjustable hard clamp mount make it easy to attach to the handlebars of any bike securely. Trek Ion Pro RT Features Powerful beam with wider throw, lights up the full width of any road or trail 1300 Lumens via high-power CREE LED 1300LM-1.5hrs, 800LM-3hrs, 400LM-6hrs, day flash-22hrs Specifically designed flash patterns for daytime visibility for up to 2km Connect with compatible ANT+ devices for always-on, battery status, and wireless control Includes adjustable light mount that fits bars from 25.4-35.0mm Includes Ion Pro RT light, adjustable hard clamp mount, and USB-C charging cable Trek Ion Pro RT Specs Battery Li-Ion 21700 3.7Vdc 5000mAh 18.5Wh Milliampere-hour 5000mAh Lumen 1300 Rechargeable Yes Charge Time 7 hours Waterproof Rating IPX4 Wireless Compatibility ANT+ / Bluetooth Weight 192 grams