1. Multifunctional safety light: It is an easy-to-install and durable bicycle taillight that can be installed on various types of bicycles, such as children's bicycles and adult bicycles. It can also be installed on handlebars, seat posts, dog collars, or other positions. It can also be used as a helmet light, backpack light, warning light, etc. 2. This bicycle taillight has a built - in USB charging interface. 3. Name: Cubelite II Smart Taillight 4. Color: Red + Black 5. Material: Aluminum alloy + ABS 6. Package contents: - 1 bicycle taillight 7. The package only includes the above items and no other products. 8. Note: Light reflection and different displays may cause the color of the items in the pictures to vary slightly from the actual products. The allowable measurement error is +/- 1 - 3 cm.