The TM515 Power Module/Mainframe provides five slots and is designed to supply all power required for the TM500-Series plug-ins. Can be used in the lab or the field, just snap on the front & back covers to protect the plug-ins and its ready to go! 6.8"H x 15"W x 20"D. A wide range of available plug-ins (sold separately) make it easy to customize equipment group to meet your needs.