This is a feedback module for current sensors on digitally controlled 2-rail layouts. This module can be plugged into the L88 (60883) with the cable included with the former. The s 88 DC has a connecting socket for additional s 88 DC decoders (60882). It also has 2x 8 inputs for current sensors (with optical-couplers) in 2 different power circuits that can be combined into a single power circuit with 16 inputs. The L88 (60883) is required for connecting this unit to the CS2 or CS3!