The ACT-712 is the USB Interface that is required for the software FreezeFrame 4 tat can be used together with the Coulbourn operant box (fear conditioning configuration). The USB Interface provides the outputs for operating the stimuli in the FreezeFrame software replacing the H91-24 5 Volt to 24 Volt Converters. The interface can control up to 8 outputs. Each output can supply 24V at up to 400 mA, or 5V at 10 mA (TTL-compatible).