Basic module: 2 panels with 5 x 30 sockets, separated by a 2 mm channel. Bus: 2 bus strips with 25 interconnected contacts distributed over 4 rows. Outer casing in ABS with color print. Voltage: maximum 30 V. Current: maximum 3 A. The plug-in board from Velleman is suitable for test circuits and experiments. It consists of an ABS outer housing with color print and stainless steel contacts.