The rapid front series are perfect for to be seen technology now with 80 lumen output this little light is a great addition for commuters and daytime ridingultra bright strip led technologyli polymer battery technology up to 80 lumen outputcomplex circuitry for safe charge and dischargeusb recharge 2hrso ring attachment6 modes high low flashing rapid pulse vibrationruntime from 1 30 hrs depending on modedimensions w 225 x h 272 x l 732mmbattery auto savelow battery indica