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.