aked on both ends before turning the humidifier on. Package includes: 1 x Mini Humidifier 1 x USB Cord 1 x User Manual 1 x Short Cotton Core(12.5*0.8cm) 1 x Long Cotton Core(20.5*0.8cm) 1 x Packing Box Note: - If you did not receive your order in time, please use AliExpress to contact me, I will provide you with effective solutions.Thanks for your understandings. - Because the time difference between countries, if sales person is not online,she will reply your email within 5-10 hours.