This is a multi-function product. It is a U-Lock to?secure your bike. And separated￡? it can be used as a front light and a taillight for safe riding at night. It is really a cool product for cycling lovers. <br><br><strong>Features:</strong> <br>Chrome plated alloy steel with plastic shell U-lock to?secure your bike. <br>3 keys included￡? you can take one and another two for spare use. <br>Separated￡? it can be used as a front light and a taillight. <br><br><strong>Specifications:</strong> <br>Lumen: 800LM <br>Battery: 800mAh lithium battery <br>Lock material: Chrome plated alloy steel with plastic shell <br>Lock size: Approx. 24.5 * 10 * 6cm / 9.6 * 3.9 * 2.4in <br>Lock weight: Approx. 681g / 1.5lb <br>Package size: Approx. 33 * 15 * 7cm / 13 * 5.9 * 2.8in <br>Package weight: Approx. 933g / 2.06lb <br><br><strong>Package List:</strong> <br>1 * U-Lock (Front Light+Rear Light) <br>1 * Front Light Bracket <br>1 * Rear Light Bracket <br>3 * Key <br>1 * Wrench