1FUNCTION: To solve the problem of harmful substances breeding, for the health of the family can refrigerator deodorization, purification of space, food preservation. 2STANDARD MODE: Work independently for 30 minutes after power on, then standby for 45 minutes, then work again for 15 minutes after 45 minutes, then standby for 45 minutes after 15 minutes, and so on. Standard mode use time of 170 hours or more, the light is blue. 3ADD QUANTITY MODE: Press the key again after turning on the machine, work independently for 2 hours, then standby for 20 minutes, work again after 20 minutes for 10 minutes, work for 10 minutes and then standby for 20 minutes, and so on, add quantity mode for more than 120 hours; the indicator is green. 4ODOR REMOVAL: Control board unique moisture proof design, for the circuit protection, can remove odor and harmful substances in the pet space, placed in the bathroom can be used daily to get rid of odor. 5USB CHARGING: Smooth surface, bass noise reduction, so you can sleep better, one touch operation, USB charging interface, can be connected to a variety of charging devices.