Product details:

Brand: CatEye

Number: TL-AU630

Dimension: 66.0 X 23.0 X 43.0mm
Weight: approx 44 grams (with bracket and batteries)
Light source:  Red LED X3
Battery: AA alkaline battery X1
Runtime:   Approx 3hrs in constant, 80hrs in flashing, and 20hrs in rapid mode
Mount size: 12.0-32.0mm (FlexTight SP-11)
Other:  Lighting mode memory function, compatible with RM-1 saddle rail bracket, rear rack mount and clothing clip (optional)