Compact bright and versatile the viz150 stands out with high visibility from opticubetrade lens technology and daytime hyperflashtrade mode in an economical package. 3 leds 150 lm highly visible during daytime 300 degree visibility long rear beam projection opticubetrade lens technology lithium ion rechargeable battery usb c rechargeable usb c cable not included low battery indicator four light modes constant flashing group ride daytime hyperflash mode memory function battery auto save the mode automatically changes to flashing when the battery power gets low. New seat post bracket sp 15 which fits contemporary kammtail aero seatpost snap systemtrade specifications dimensions 21 x 62.5 x 32.5 mmweight 27 glight source red led x3battery li ion rechargeableruntimendash constant 20 lumens 5 hrsndash flashing 15 lumens 70 hrsndash group ride 5 lumens 33 hrsndash daytime hyperflash 150 lumens 15 hrsrecharge time 3 hrs 0.5amount size phi21.5ndash32 mm. Fits up to 130 mm outer circumference sp 15water resistance ipx4other features battery auto save low battery indicator light mode memory