It is integrated Pre-amp with 60dB Gain Control, Zero-Latency Monitoring and 48V phantom power.   

** DYNAMIC & CONDENSER MICS – Up to 60dB of Gain and 48v of Phantom Power.  It can level up any XLR microphones.

** HEADPHONE MONITORING - Zero-latency Audio Monitoring and Playback via built-in 3.5mm headphone jack