HECTO DRIVE 500XL (FRONT)* Max 500 lumens / 20 hour runtime in Femto mode * New housing with stylized heat dissipation fins* Silicon rubber strap* IPX7 water resistant* Integrated USB stick for cable-free rechargingFEMTO USB DRIVE (REAR)* 5 lumens* USB Rechargeable Rear LED Light* Wide angle optics with 270å¡ visibility for maximum safety* Aero seat post compatible, with versatile mounting strap* Lightweight and durable, co-molded design* IPX7 water resistant