1,Plastic material:PP+GPPS+ABS 2,refinement design 3,convenient fixing and disassembly 4,warning and lighting founction 1,Plastic material:PP+GPPS+ABS 2,refinement design 3,convenient fixing and disassembly 4,warning and lighting founction 5,use 2*AAA 1.5V battery 6,5 LED bulbs with 8 different lighting mode 7. Luminance:5000-7000MCD 8,bulb life span 100000 hours bicycle rear light