Feature: 1. Do not damage the helmet, use double-sided glue, the residual gum after tearing off is less, some remain wasted with the cleaning essence can clean. 2. Durable, not easy to age, the flashing bar is waterproof. 3. Bright at night, waterproof, high and low temperature resistance. Specification: Name: helmet light bar. Power supply: 2xAA Batteries (not included). Drive function: constant light, slow flash, fast flash Usage time: 6-7 hours available after charging for 2 hours. Luminous color: Red, purple, White, blue, green, yellow, orange, ice blue, pink White light, pink. Notice: 1. Please allow 1-2cm error due to manual measurement.Please make sure you do not mind before you bid. 2. The colors may have different as the difference display,please understand. Package Included: 4 X Helmet Light-Emitting Strips. 1 X 3V Battery Box. 1 x Extension Cable