FINALLY, A NIGHT COVER THAT HAS IT ALL An industry leading five-year warranty, retraction tension adjustment and an upper limit stop are just some of the features that other ordinary night covers do not offer. The GreenWizeNC night cover is available in either OEM (no aluminum cover) or Cassette (aluminum cover). Custom lengths and colors are available as well as screen printing the cover material. The night cover has an exclusive “thumb wheel” adjustment that allows customers to adjust the retraction speed without using tools or taking the night cover apart. The NO FRAY material of the night cover is UL 94 rated. In addition, the covers have the option of an upper limit stop adjustment that allows the customer to determine how far the cover will retract. All of these features assure the customer of a LONG LIFE night cover that will save energy for years and years.