[USB Rechargeable]Built-in rechargeable battery with power display and charging port. The bike handlebar extension has a rechargeable function, which can be charged through the USB port of your computer or other power sources. You can use it to charge your cell phone without worrying about your phone shutting down outdoors. Make sure the charging point stays closed in rainy days. [Durable]The bike grip extender is made of lightweight aluminum alloy, durable and resistant to corrosion, rust or fading. Use high quality durable screws to provide double protection. Equipped with hex wrench, easy to install and remove, use and adjust. [Multifunctional Bike Extender]Bike handlebar extender adds extra space to your bike for fixing bike lights, speedometer, GPS devices, smartphone racks, etc. [Compatibility]This bicycle handlebar extension fits most bicycles and is suitable for various handlebar sizes from 25.4 mm to 31.8 mm in diameter. (Please note: Due to the different handlebars, please try to find a suitable position on the handlebars to install this extender to avoid the problem of easy slippage.) [High-capacity lithium battery]The high-capacity lithium battery has a removable and durable battery, and there are removable 18650-capacity batteries on the left and right sides. Material: Metal colour: black Package Contents: 1 x bike extension 2 x battery 1 x data cable 1 x english manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.