The Meade #541 works with the "EC" series ETX-90/ETX-105/ETX-125 telescopes, the entire LX10/LX50/LX90 lineups, older DS series scopes (later models instead require the #546 adapter), the #1701 and #1702 axis drives for the LXD500 series scopes and the 201XT/208XT/216XT CCD cameras and autoguiders.
The #541 is actually two adapters in one. It has an AC adapter that plugs into a normal household outlet to convert 110-120 volt AC power to 12-volt DC power, which is output through an attached female cigarette lighter plug. It also has the #607 DC adapter cord with male cigarette lighter plug upon one end and 5.5mm male plug on the other. The 5.5mm plug fits into the 12-volt DC power receptacle in the drive base of the "EC" series ETX-90/105/125 scopes and the LX10/LX50/LX90 models.