Pls see the manual before use the equipment;18 months free warranty for optical transmitter,EDFA and digital equipments(natural disaster and anthropic loss are not included);one year for RF Amplifier,splitter&Tap,optical splitter);Prevail will provide 0.5% of order quantity parts for free (example for the power supply and display etc).If there is a problem ,pls send email to us,we will try to solve it by our engineer.