HECTO DRIVE 500XL (Front)* Maximum output of 500 lumens / Battery life of 20 hours in Femto mode * New housing with heat dissipation fins* Silicone strap* IPX7 water resistant* Integrated USB stick for cable-free chargingFEMTO USB DRIVE (Rear)* 5 lumens* USB rechargeable LED rear light* Wide angle optics for 270° visibility for maximum safety* Compatible with aero seat posts with versatile mounting strap* Co-molded, lightweight design and durable* IPX7 water resistant