FEATURES USB Rechargeable, built-in 680mAh battery Flashing, Steady (solid red), and Daytime Flash modes Power-saving mode: if the light does not detect motion for more than 120 seconds, it will enter sleep mode, then power back on when motion is detected IPX6 waterproof rating Just 40.6 grams! RUNTIME AND LUMEN OUTPUTHigh Steady: 40 lumens, about 3.5 hours of runtimeMedium Steady: 20 lumens, about 5 hours of runtimeLow Steady: 5 lumens, about 33 hours of runtimeHigh Flashing: 40 lumens, around 18 hours of runtimeLow Flashing: 5 lumens, around 85 hours of runtimeDaytime Flash: no lumen output, about 25.5 hours of runtimeCOMPATIBILITYWorks with Aventon Pace series, Level, and Sinch ebikes, as well as the Cordoba fixed gear bike. Also fits most other makes/models of bikes that use a round seatpost. Will not fit the aero wing-shaped seatpost on the Aventon Mataro. This tail light offers a variety of modes and attention-grabbing flash patterns. Mounts easily to your seatpost with a rubber strap so it can be installed or removed in a flash.