The general should be guaranteed for one year, basically this time on the bad, the quality is really bad, repair is also troublesome, Qingdao is not, but also sent to Jinan, good in Qingdao to find a more professional maintenance of the oxygen concentrator store, in the Shanghai Road and Laizhou Road intersection, near the Danyaogou neighborhood. His family is mainly wholesale and retail oxygen concentrator, I later bought a huge trade in the store, warranty three years, really good concentration of high noise. Repair of the fish leap oxygen concentration has been less than medical, stay as a spare machine, throw a pity, really chicken ribs. Contact information is not available, check Baidu "Qingdao Haiyi medical equipment" or private message me to help you find , Baidu map should be able to find