Nebulizer factory This product can be recharged. When the lithium battery power supply voltage is less than 3.6V, the blue and red indicator lights will be on at the same time. When the voltage is lower than 3.1V, it will automatically shut down. Please charge it. The red light is always on when charging. Green light, charging time is 3-4 hours. It can work for about 1.5 hours after fully...