Captures 99% of Allergens: Car air purifier with True HEPA (High Efficiency Particulate Filter), three-stage filtration process that removes up to 99% of harmful gases, smoke, bacteria , odors, dust, pollen, pet hair and other vehicle particles. 4000mAh Rechargeable Design: This smokeless ashtray is equipped with a 4000mAh battery, can be used for up to 20 hours on a full charge. Avoid replacing batteries frequently, and you can use it not only in rooms, but also in the car or outdoors. High concentration negative ion release: built-in device with high concentration of negative ions. negative ions which reduces dust, fresh air and increases the content of negative ions in the air. [Pregnant women and children's health design]: Protect the health of your family and of your children, renounce the harm of second-hand smoke, and provide your family with a healthy environment. Ultra-quiet function: press the switch to change the fan speed and turn on/off, just one key turns on the air