Simply ride around with your brakes half on for about 5 minutes and pedal hard

Dimensions: 115 x 190 mm

Reinstall the seat collar by hand

Output and Runtime: There are 3 steady modes and 2 flash modes in total

Cateye Rapid X2 Kinetic Rear 50 Lumen LED-USB Light PDP|Option Simply ride around with yourThe Rapid X LED light is a is USB rechargeable with a low battery 'auto save' function that automatically changes the light mode to flash when it gets low to give you an extra hour of light to safely make it home. Specs: 50lm LED Mounts to your seat post (12 32mm) Lithium ion polymer battery Micro USB Attaches to the existing CatEye bracket by using the optional Spacer X 6 modes with memory function High mode1 hr Low mode5 hrs Flashing mode30 hrs