Note: Battery performance depends on several factors - Tire size and type: Inflating larger or higher-pressure tires will drain the battery faster. Temperature: Cold weather reduces battery efficiency. Proper charging: For optimal battery performance, it's recommended to fully charge the pump before each use. We provide 24-hour online support and 3-year warranty on this air pump, if any questions, pls feel free to contact us. Muti-function: This versatile mini air pump features four interchangeable nozzles for inflating a variety of items, such as car and bicycle tires, sports balls, and inflatable toys. This bicycle pump not only functions as an air pump but also as a versatile emergency tool. The top flashlight has three modes (flashlight, SOS, and strobe) for easy illumination at night and operation. The air compressor is equipped with USB-C and USB input/output ports, providing backup power for your phone and other electronic devices. Auto Shut-Off & Accurate LCD Display: car tire air pump builts in pressure gauge and LCD screen, which you can accurately monitor real-time tire pressure. You can easily select your desired pressure using the "+" and "-" controls. Simply connect the air hose to your car and press the "Start" button in the middle of the pump. Once the correct pressure is reached, it automatically shuts off, ensuring optimal tire performance and safety. This cordless car tire pump makes inflating all your tires hassle-free. Long Battery Time: Built in high-capacity rechargeable batteries, No need to connect the external power supply when using. It inflates three times faster and delivers 30% more power than other cordless inflators. The batteries can be easily charged via the Type-C charging port. It takes about 1.5 to 2 hours to fully charge the Tire Inflator. Multiple Inflation Modes: With the touch of a button, you can easily switch between pressure units of PSI, kPa, BAR, and KG/CM. Four preset inflation modes are available for bicycles, motorcycles, cars, and balls. Additionally, the fifth custom mode allows you to customize the pressure based on the object being inflated, allowing you to achieve a wider range of inflation options.