Amazing value all in one 100 lumen front & rear light set package. AMPP100 FEATURES: Compact rechargeable headlight (100 lm) Up to 35 hours runtime Features - Easy to attach and remove, new & improved rubber band mount with 360° rotation Excellent side visibility Low battery indicator Lithium-Ion USB rechargeable battery (Micro-USB cable included) Mode memory function Two light modes (Constant / Flashing) Weight: Only 62g RUNTIME: Constant (100 lumens)：3.5 hrs Flashing (100 lumens)：35 hrs Charging time (From empty) : 2.5 hrs ViZ100 FEATURES: 3 LEDs (100 lumens) Focused lens for maximum visibility Highly visible during daytime Superior 300 degree visibility Long rear beam projection OptiCube™ lens technology Lithium-ion rechargeable battery USB rechargeable (Micro-USB cable included) Low battery indicator 4 modes: Constant / Flashing / Group Ride / Daytime Hyperflash Mode memory function Battery Auto Save (The mode automatically changes to flashing when the battery power gets low.) New seat post bracket SP-15 which also fits contemporary (Kammtail) aero seat post. Snap System™ bracket. Runtime: Constant (15 lumens)：5 hrs Flashing (10 lumens)：70 hrs Group Ride (35 lumens)：11 hrs Daytime Hyperflash (100 lumens)：15 hrs Charging time (From empty) : 3 hrs