20 lumens. Flashing/Constant. Aluminium Construction. Easy to install and fit. Simple and Straight forward Design. Specification Size: 40x28x33 mm. Weight: 31 g (without battery). LED: 1 White LED. Battery: CR2032 x 2. Bracket: Fit Ø19-Ø32, with 1 rubber pad. Runtime Flashing: 90 hrs. Constant: 30 hrs.
Best Price: £4.50 from Merlin Cycles