KNOG Blinder Road 3 USB Rechargeable Light for Bike Helmet UV-resistant, industrial-grade silicone rubber body with aluminum fascia and stainless steel latch; Polycarbonate Housing; PMMA Lens 2 x Cree XB-D LEDs, 300 lumens max Rechargeable Lithium Polymer battery (USB) Low-beam modes: Steady 5 hours, Flash mode 6 hours Medium-beam modes: Steady 2 hours, Flash mode 4 hours; High-beam modes: Steady 1 hour