Cateye REFLEX AUTO Tail Red (Auto Light) (Rear) TL-LD570-R

Size: 81.4×44.3×30.3mm Weight: 66.8g (body + battery) Batteries required: 2 x AAA batteries (alkaline batteries recommended) Usage time: Steady: Approx. 30 hours / Rapid: Approx. 60 hours / Long life: Approx. 120 hours / Pulse: Approx. 30 hours / Flashing: Approx. 100 hours "Auto light" with built-in dual brightness and vibration sensors that automatically turns on when driving at night