Freely-Moving Configurations Mice: untethered data logging only miniLogger 32 Logger Dock 32-Channel Electrode Interface Board (EIB) Mice: options for untethered data logging and tethered recording Main Control Unit (MCU) Environmental Control Unit (ECU) miniLogger 32 Low Torque 32 Channel Commutator 32-Channel Electrode Interface Board (EIB) RF Transceiver Rats: untethered data logging only Horizontal Headstage 128 Channel with Datalogger Logger Dock 128-Channel Electrode Interface Board (EIB) Rats: options for untethered data logging and tethered recording Horizontal Headstage 128 Channel with Datalogger Main Control Unit (MCU) Environmental Control Unit (ECU) General Purpose Commutator with Through-Bore 128-Channel Electrode Interface Board (EIB) RF Transceiver High channel count (rats and larger): for untethered data logging and tethered recording Main Control Unit (MCU) Environmental Control Unit (ECU) Modular Stacking Headstages 64 to 1024 channels General Purpose Commutator with Through-Bore Custom Electrode Interface Board RF Transceiver