Blackburn central 20 rear light a bright powerful rechargeable led rear light the two super bright leds emit a 20 lumen safety beam the large power button is easy to turn onoff whilst pedaling or wearing gloves the flexible silicone mount fits to all seatposts diameters and shapes also has a versatile wire clip attachment that allows it to be fixed to shoulder straps panniers or pockets three light modes 25hrs solid 42 hrs steady flash 76hrs strobe only takes 4 hours to fully recharge