[USB Rechargeable] Built-in rechargeable battery with power display and charging port. The bike handlebar extension can be charged via the USB port of your computer or other power sources. It allows you to charge your cell phone while riding, ensuring your device stays powered during outdoor use. Designed to protect the charging port in rainy conditions. [Durable] The bike grip extender is made of lightweight aluminum alloy, resistant to corrosion, rust, and fading. Features high-quality durable screws for added security. Includes a hex wrench for easy installation, removal, and adjustment. [Multifunctional Bike Extender] Provides extra space on your bike handlebars for mounting accessories such as bike lights, speedometers, GPS devices, and smartphone mounts. [Compatibility] Fits most bicycles with handlebar diameters ranging from 25.4 mm to 31.8 mm. For best results, find a secure position on the handlebars during installation to prevent slippage. [High-Capacity Lithium Battery] Equipped with a removable high-capacity lithium battery. Features two removable 18650 batteries, one on each side. Material: Metal Color: Black Package Contents: 1 x Bike Extension 2 x Battery 1 x Data Cable 1 x English Manual Note: Light reflection and differences in display screens may cause slight variations in color compared to the actual product. Measurement may vary by +/- 1-3 cm.