Welcome to ZTTO Official Store! Item Name: Smart Bicycle Taillight Material:ABS,PC Batteries: 420mAh Size:4cmx4cmx3cm/1.57inx1.57inx1.18in Description: Using high-quality lens shade, it has uniform light and strong penetrability. It has IP65 waterproof level, and the battery has a long life. There are six models, including constant light, breathing flashing, slow flashing, fast flashing, rhythmic flashing, ECO fast flashing. With its vibration induction and automatic wake-up functions, the light will automatically turn off when parking for 30 seconds without vibration, and it will automatically turn on when vibration is felt. The tail light interface is USB port, and you can charge anytime and anywhere. Made of ABS and PC materials, it is durable. The length of the product is 4cm, the width is 4cm, and the height is 3cm. It is suitable for bike night cycling. Notes: Due to the light and screen setting difference, the product's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 X Smart Bicycle Taillight 1 X USB Charging Cable