Item Type: Air Ionizers. USB CHARGING: Smooth, bass noise reduction, so you can sleep better, one touch operation, USB charging interface, can be connected to a variety of charging devices. ADD 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.
