Cateye TL-LD1100 10 LED Rear Light
No other LED light offers the same level of all-round visibility.
Opticube technology is combined with 10 Ultrabright red LEDS for unparalleled brightness - incredibly, this light is 80% brighter than the LD1000.
6 LEDS face backwards and 2 are positioned on each end - each row can be independently controlled through 4 different modes for a total of 16 different combinations. Requires 2 x AA batteries (included)