Features: Secure your bike day and night with this double function bike lock features a smarted light sensors and USB rechargeable LED tail light for enhanced visibility and thefts prevention. With high strength steel cable wrapped in PVC coating and durability ABS housing, this weather resistant lock automatically activates its light in low light conditions through intelligent light sensing technology. Ideal for commuters, cycling enthusiasts, and students seeking reliability security and increased safety during evening rides or poorly lit environment. Perfect for nighttimes cycling on city streets, weekends trail adventures, or parking in dimly lit areas where visibility and thefts deterrence are critical concerns. Effortlessly installs on most bicycles frames without tool, combining anti thefts protecting with energy efficient illuminating that lasts up to 20 hour. Specifications: Dimension:15×12×5cm/5.9×1.97×4.72in Component:Steel Cable + PVC Package Includes: 1pc Rechargeable Bike Lock With Automatic Light note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.