ITEM NAME:5V Motorized Bike Friction Generator Dynamo Dual USB Interface Charger Blue Description: Wide applicability, can install all bikes with front or rear fork between 15-41mm in diameter. Energy saving and environmental protection, never turn off, charge and lighting. For long distance cycling, riding 5-30km/h and generating about 100-1000mA of electricity. Easy to install: include complete installation tools, compact and fashionable, using own small tool to complete the installation, DIY easy. Made of high quality plastic and electronic components material, sturdy and wear resistance, waterproof, durable, long service life. Specification: Item Type: Electric Bicycle Generator Output: DC5V/1A Battery: 1000mAh Rechargeable Polymer Lithium Battery Material: ABS Size: approx. 8x9x5cm(3.15x3.54x1.97inch) Quantity: 1 set Package Includes: 1 Piece Electric Bicycle Generator 1 Set Installation Tools Accessories Note: Please allow 1-3cm error due to manual measurement..Item Type: Electric Bicycle Generator. 1 Piece Electric Bicycle Generator. Easy to install: include complete installation tools, compact and fashionable, using own small tool to complete the installation, DIY easy.