Check the listing for details. ATARILAB LIGHT MODULE W/Cartridge NEW NEW IN BOX 800/XL/XE. Listed at 19.95 USD. ATARILAB Light Module. Cartridge with extensive manual, Light source, light sensor, color filters ETC. Atari 400/800/XL/XE. "Requires ATARILAB Starter Kit"! Available in a separate auction or at my Ebay store. INVITING EXPERIMENTS AtariLab stations invite experimentation. They are easy to install, simple to use, and accept either joystick or keyboard input. Data sets are displayed on four-color graphs, and results can be seen quickly. The AtariLab Light Module helps you explore principles of light and include a 16K program cartridge, a extensive manual, light sensors, light detector and color filters. The manuals give easy to use instructions for writing your own programs in whatever language you want. You can also use a second interface module with XL/XE computers and up to 4 interface modules with 400/800 computers. This means with an Atari 400 you can monitor 8 temperature or light sources at once time. Would require 4 Starter and 4 Light Modules but on one computer. ATARILAB Light Module. Cartridge manual and Light probes. New in the Box(NIB). Computer and Starter Kit required and not included. Estimated shipping weight is 3 pounds. Click here to review my terms & conditions."If you do not understand something about an auction then PLEASE contact us and get an answer you understand before purchasing. EBAY NOW CHARGES FEES ON SHIPPING AND HANDLING. WHEN YOU BUY MULTIPLE ITEMS AND PAY BEFORE WE SEND A COMBINED INVOICE YOU MAY PAY A LOT OF EXTRA SHIPPING."