Lookatool USB Charge Bicycle Light Silica Rear Light Riding Warning Lamp Acrylic 100% brand new and high quality. Beautiful of Stype design. Life waterproof. Material:LED. Size:7.5*3*2cm/3.0*1.2*0.8". Battery:Rechargeable lithium battery(include) USB charge,full automatic power-off. Charge Time:About 2 hours. Each full charging could maintain abour 12 hours. Light mode:Steady,Cycle slow flash,Cycle quick flash,Crazy flash. Usage: 1. Click the silica button once to open the Steady mode. 2. Click the silica button twice to turn into the slow flash mode. 3. Click the silica button third to turn into the quick flash mode. 4. Click the silica button fourth to turn into the crazy flash mode. 5. Click the silica button fifth to turn off the power.