This bicycle light is made of silicone and LED light, which possesses waterproof and odorless characteristics, with good durability. The lights can be installed easily without other tools. The elastic buckle can fit most seat posts, handlebars, seat risers, backpacks and more, you just need to stretch it to hold some items securely and firmly. And each light has three specific modes of full light, fast flash and slow flash, so you can be easily seen in early morning fog, dusk, nighttime, and dawn. The logo can be printed on the side. 16 15/16" L x 8 1/4 "W x 11 13/16"H