The Numen Combo 3 is the ideal pairing for riding in low light conditions. The front light has a bright, 60 lumens output with a huge 120 hour run time (mode dependent). The mount fits all standard round handlebars. The rear light features a 20 lumens output & 180 hours run time & can be mounted either vertically or horizontally. Front: Output: 5 bright LEDs, 60 lumens Modes: 3, high / mid / flash Power: 3 x AAA batteries Run time: Up to 120 hrs Mount: Rotational 3 position mount Rear: Output: 5 bright LEDs, 20 lumens Modes: 2, steady / flashing Power: 2 x AAA batteries Run time: Up to 180 hrs Mount: Mounts vertically or horizontally