I bought it from the local distributor after the montly official gathering of Hong Kong Strida Club yesterday. 
cateye.com/en/products/detail/HL-EL540RC
Specifications
Dimension：114.0 X 56.0 X 53.0mm
Weight：244 grams (with bracket and rechargeable battery)
Light source：High power white SMD LED X1
Light output： 4000cd
Run time：
High mode：approx 5hrs
Low mode：approx 15hrs
Flashing mode：approx 60hrs
Battery：NiMH (AA) rechargeable battery X4
Recharge time：approx 5-7hrs
Other：Low battery indicator
