One year free charge during guarantee period after final acceptance. The Sellers should repair and maintain the machines for normal wearing and trouble. The Sellers should reply with the action report and instruction to solve the problems via phone or e-mail within 12 hours after the notification of the Buyer if equipment failure happens. If the Buyers couldn’t solve the problem by following the Sellers instruction, the Sellers will send engineers to the Buyers, On-site maintenance time depends on the visa conditions, normally within one week.