Dear guys, please leave your color selection(Blue, Purple, White), or we will send you Blue as default, thank you. Features:100% brand new and high qualityYou can take bottle caps humidifier with you wherever you go and enjoy healthy air anywhere! Compact enough to fit into your travel bag. Just add your own water bottle, plug the unit in and enjoy clean, moist air in your room. Efficient ultrasonic technology uses high-frequency vibrations to generate a micro-fine cool mist, which is blown into the room where it immediately evaporates. Stay healthy and be more productive at work. Set the mini humidifier on your desk or in your office and enjoy clean, moist air throughout the day.This unique design bottle cap humidifier can make your home useless water bottle into a fashion humidifier.Best choice for office, sitting room, bedroom, car, yoga and spa. How to use:Step 1. Pile the filter in to humidifier completely, when you pull it out, please do it on the opposite direction.Step 2. Use humidifier to replace the bottle cap.Step 3. When you insert USB electric wire or battery charging wire of smartphone, then the humidifier will start immediately and micro mood light will also be lightened. Specifications:Input voltage: DC 5VPower consumption: 2WPower supply: USB ChargingHumidification amount: 40ml/hHumidification area about 5 square meters Noise: ＜36dBMaterial: ABSPackage size: 7.7x7.7x12.5cm(3.03x3.03x4.92in)(approx)Filter sticks length: 12cm(4.72in)(approx)Dimensions: 64x74mm(2.52x2.91in)(approx)Color: Purple, Blue, WhiteQuantity: 1 set Note:Transition: 1cm=10mm=0.39inchWith retail package.Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect t