Bike Seat Calibrator Tool for Seat Center Adjustment and Measurement – Laser Aligner for Bicycle Handlebar and Saddle Alignment – Tire and Saddle Position Indicator Bicycle Handlebar and Saddle Calibration Device with USB Charging – 180mAh Rechargeable Bike Maintenance Accessory Features: 1. Precision Alignment: Easily mount the tool to the center of the handlebars; when the laser aligns with the tire's center, ideal positioning is achieved. 2. Versatile Use: Designed for multiple alignment tasks, this tool helps adjust handlebars, saddles, and other components for optimal bike setup. 3. Durable Construction: Made from high-quality materials to withstand regular use, ensuring long-term reliability for bike maintenance. 4. USB-C Charging: Equipped with a built-in 180mAh polymer battery, rechargeable via USB Type-C for convenient and eco-friendly operation. 5. Effortless Setup: Eliminates guesswork in alignment, simplifying saddle and handlebar adjustments for a straight and comfortable ride. Specifications: Origin: Mainland China Main Material: ABS Color: Black Size: Approx. 11cm x 7.6cm x 5cm (4.33in x 2.99in x 1.97in) Gross Weight: Approx. 125g Charging Type: Type-C Battery Type: Built-in Polymer 180mAh Note: Due to differences in monitors and lighting, the actual item color may vary slightly from the images. Please allow 1-2cm variation due to manual measurement. Package Includes: 1 x Bicycle Handlebar Saddle Positioner