Features: 【Precise Satellite speed Monitoring】 Features enhanced satellite reception for real time 0 255 speed display with minimal lag. Built in unique "speed Calibration" (50% 150% adjustable). 【Global Unit Adaptation】 Accommodates international driving preferences with quick unit switching between miles and kilometers. 【Adjustable speed Alert】 Customizable speed notifications with three preset ranges (up to 255). Timely warnings help prevent speed violations. 【Automatic Light Adaptation & Multiple lighting Settings】 Equipped with light detection for automatic brightness control additionally manual 0 11 step adjustment. 【Contemporary Power Connection & Rotary Control】 Modern power port provides stable 5V energy supply (exceeding potential not recommended). Specifications: Power connection: Type-C (USB-C) - currently the most stable and global connection type Input potential: 5V direct current (Note: Do not link potential exceeding 5V) Display unit: speed (mile) / KM/H (kilometer) switchable Speed extent: 0 - 255 (real-time dynamic display) Fine adjustment coefficient: 50% - 150% (manually adjustable) Safety function: Three- levels segmented speed alarm Light sensitivity control: automatic light sensitivity + 11 levels of manual brightness fine-tuning Operating hardware: flexible rotating wheel (supports long press/short press/scroll action) Package Includes: 1 x Digital display head-up display body 1 x Type-C power cable 1 x anti-slip adhesive pad on the bottom 1 x User Manual note: It only supports 5V standard USB power supply