Cateye TL-LD610 Rear LED Cycle Light Five LED Bulbs and four different flashing modes: the Cateye TL-LD610 Rear LED Cycle Light is designed for commuters and those regularly out and about in urban and rural areas. The TL-LD610 Rear LED Cycle Light will keep you safe and sound when on the roads, it\'s sleek low-profile interface and buttons prevent you from accidentally switching off the light. - T.H Key Features: Mount Size: 13 - 32 mm. 4 modes (flashing, constant, side to side & random). Operating time (up-to): 30 hours (constant) / 60 hour (flashing) (Manufacturer Claimed). 5 bright LED\'s. 80,000+ MCD for a bright red LED light. A new low-profile switch eliminates the accidental switching on/off of your light. Batteries easily replaced using sliding door on the rear of the light. Requires 2 x AAA batteries (Included).