Negative Ion Purification: Our ion air purifiers for bedroom uses negative ion technology, which adsorbs floating impurities in the air, such as dust, dander, pollen, etc., and accelerates their sinking into the floor. Relieves congestion and purifies odors, making the surrounding air clean and fresh. Silent Operation: The noise of this small air purifier is below 30 decibels, and it is basically silent when working. Especially friendly to the babies and the elderly. The negative ion air purifier released negative ions that can laxation pressure and fatigue, improve sleep, concentration. High quality portable Air Purifier deliver good air for you in 24 hours and build a personal protective circle. Plug and Play & Energy Efficient: Simply plug in and the air purifier for bedroom works immediately, no installation. The mini negative ion air purifier will make a blue LED 'mood' light and aslo has a fairly quiet hum(it is the negative ion is running which is a normal phenomenon) When working. Air ionizer purifier plug designed is lower power consumption and safer. No Need The Filter: The air purifier for home will produces a large number of negative ions which can adsorb and neutralize the impurities in the air, and accelerates their sinking into the floor. The negative ions aslo increases the amount of oxygen in the air, and improving the indoor air quality. Wide Application Scenarios: Plug-in portable air purifier size is about Length:10cm/3,9in, Width: 6cm/2.36in, Deep: 3cm/1.18in(not including the plug teeth), plug teeth size is about 3cm/1.18in, weight is about 85g *1pcs, 170g *2 pcs. Air purifiers suit for office, bedroom, bathroom, kitchen, toilet, porch, corridor, wardrobe, pet room etc.