The HS-54 is a preamplifier headstage providing 54 channels of unity gain amplification including 50 electrode channels, two references, and four unbuffered differential stimulus channels. Colored LEDs are placed along the headstage for use with the Cheetah Video Tracker. It is designed to connect to the the Kopf/NASA 14 hyperdrive with the EIB-54-Kopf. Tethers for this headstage are sold separately.