H7129 is an air purifier with built-in Particle Sensor, CARD 150CFM, HEPA filter with H13, comes with air quality indicator and RGB ambient night light. It supports Bluetooth and WIFI, and can be controlled via a mobile phone app. You can check the record of air quality changes on the APP, and the Auto mode will automatically adjust the level according to the air quality detection to achieve energy saving. Auto mode will automatically adjust the gear according to the air quality detection to achieve the purpose of energy saving.