Block Light Rear is a compact, rechargeable bicycle light. The design is based on the now classic, well-known Bookman Light – with the addition of a sleek lens to distribute the light. On the inside, however, everything is new. Equipped with the latest LEDs and Lithium-ion battery to make it super bright, yet long-lasting in battery time. With its four different modes, it is perfect for the commuter or the dedicated road cyclist that are looking for a slim light to illuminate their twilight rides. - Super bright: 18 lumens - Runtime: Up to 25 hours - Charging time: 2 hours from flat - Package contents: 1 × Block Light Rear and 1 × Micro USB cable MODES BRIGHTNESS RUNNING TIME (H) 100% Steady 18 1.5 100% Blinking 18 3 25% Steady 5 5 25% Blinking 5 27