Modes include high steady low steady and slow flash low battery indicator illuminates when power is less than 25 water resistant lightweight weighs only 44 grams 40per unit41 fully usb rechargeable no batteries to buy or replace multi fit quick release system allows easy tool free onoff handle bars fits sizes 2232mm 4010 32mm for avenue r 2041avenue f 35 lumen output 35 lumens beam distance 7 meters beam intensity 11cd avenue r 20 lumen output 20