This USB rechargeable front and back lights, a built-in 2000mAh rechargeable lithium battery for the headlight, and a built-in 330mAh rechargeable lithium battery for Taillight. It is equipped with a mounting bracket that can be easily fixed to the handlebar. The price drops from $26.99 to just $16.14. Shipping is free for Prime members and nonmembers get free shipping over $25.