Cateye TL-AU100BS 6 LED Rear Light with integral reflector BS 61

Complies with British standard BS6102/3 in constant mode, designed for the UK. Constant for 40 hours or flashing for 80 hours. Includes 2 x AA batteries. Fits to seatpost or thick seatstay via adjustable type band (# 544-0892 18 -40mm) Or could be used with 544-0980 bracket only & ESGE J82S rear rack bracket (SJSC part # 553 )to fit to rear rack. Lens 40mm wide x 70mm high.