Provide targeted installation video; Under the premise of correct installation, normal maintenance and using, we guarantee one-year warranty period; When warranty period has expired, our sold products enjoys lifetime guarantee repair, we only charge cost price for changing product’s standard component and sealing component; During installation and adjustment period, our after-sale service staff will communicate with customers frequently to know product’s running state in time. Assist customers to install and adjust products until customers are satisfied; If product has malfunction during operation period, we’ll offer you satisfied answer in time. Lifelong free technical support. Conduct satisfaction survey and inquiry equipment running condition to clients by telephone or e-mail semiannually from the first day of equipment running, put on records of acquired information. Provide assistant service if product is damaged during transportation.