GVR Bicycle Adult Helmet Jump Silver With Visor G203VJPML-BLK Size:M/L but indirectly proportional to the

but  indirectly proportional to the speed and acceleration you get

The supplied plastic case keeps your smart phone dry and handy

Logs up to 500 hours in 5-10-20 sec intervals

Output: 5 bright LEDs

Regulates blood pressure: Snergy also prevents high blood pressure as it contains magnesium which relaxes smooth muscle cells leading to effortless blood flow

GVR Bicycle Adult Helmet Jump Silver With Visor G203VJPML-BLK Size:M/L but indirectly proportional to theSPECIFICATIONS: Size: M L (56cm~61cm) Size can be adjusted by adjustable head ring Weight: 250g 17 ventilations with stylish design and help cyclists stay cool Equipped with 1 removable tinted magnetic visor which is easy to remove from helmet and attach onto helmet by truing up and down Removable lining with anti biotic odor fabrics with permeable mesh net which can stop bugs from entering Approved safety standards by CNS (Taiwan) and JCF (Japan)