Minirator MR2 is a powerful audio generator, offering a full range of analog test signals for calibration, maintenance and repair of professional audio equipment. The signals include sine, pink noise, white noise, polarity, sweeps, chirps and delay. Instrument operation is enhanced by a rotary wheel, surrounding fast access keys, a backlit LCD, illuminated mute button, safety hand strap, jack for external DC power supply and an USB interface for firmware updates.