1.How to maintain the suction power of the nasal aspirator for baby? (1) Please check whether you have clean and dry the suction chamber after each use. Leftover mucus or liquid might block the air flow the of aspirator and cause weak suction. (2) It is recommended to soften dry nasal mucus with saline water for 30 seconds to 1 minute before using this product for nasal mucus suction. Since the baby nose sucker can not suck out dry or hard booger directly. (3) Please choose the appropriate gear for different congestion situation or according to baby‘s age. If you think the suction is not strong enough, please choose higher gear. 2.Why the booger sucker for baby is not working? (1) Please check whether you have install the suction chamber correctly? Twist the chamber clockwise till hear a click to make sure it’s fits tightly. (2) Please check whether the sealant rubber ring around the suction chamber base works well? Fit it tightly before screwing the suction set into the suction port. (3) Please don‘t wash the machine main body. The body is not waterproof. 3.How to avoid leaking or back flow? (1) Please empty the suction chamber before mucus exceed 1/2 of entire storage capacity. Otherwise snot will overflow. (2) Use the electric nose suction for baby in upfront position to avoid back flow. (3)Turn off device RIGHT AFTER snot sucking finished to avoid mucus back flow. 4.Why your nose sucker for baby can’t be turned on after charge? Or how to charge your device correctly? (1) Please make sure you are using 5V adapter to charge the device, voltage over 5V can NOT charge the device. (2) The baby nasal aspirator can NOT be turned on while charging. 5.How to maintain the nose sucker? (1) If liquid enter machine, remove storage chamber then run the machine for 5-10 minutes to drain liquid entered the motor, then wipe away stains. This will clear out the liquid inside the pump, to keep device last longer. (2) To keep the battery healthy, charge the battery to 100% every two months if you do not need to use it for a long time. 6.How to prevent damage to the nasal aspirator? (1)The baby nose sucker is designed for operated by adults. Keep i t out reach of child to avoid them accidentally broken th e device body like buttons, plastic housing etc. (2)Please follow user manual to assemble the product c orrectly, wrong assemble method will damage the baby nose sucker.