Overview Reviews Product Description This is a physical product. Extended Warranty license must be registered at the same time as the NAS warranty.Models - DX517 / NVR1218 / VS960HD/DS920+/DS420+/DS720+/DS1520+ / DS1621+ /DS1821+/ DS1522+/DS923+/DS423+ Product Videos Custom Field Product Reviews (No reviews yet) Write a Review Write a Review × SYNOLOGY Synology Warranty Extension - Extend warranty from 3 years to 5 Years on selected models Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name *Email *Review Subject *Comments