This special-purpose eyepiece includes a reticle with phosphorescent-etched crossline patterns, internally illuminated so the lines are clearly visible against dark skies. It has an extremely limited eye relief of 3mm, dioptric correction, and a double crossline reticle. It can only be powered by a Meade drive base or Accessory Port found upon their various scopes (LX3, LX5, LX6, Premier, LX90 w/ the #909 Accessory Port Module, LX100, LX200 Schmidt-Cassegrains, ED refractors, etc.), and comes with a 6' cord.