The MO2020 Provides A Sine and Square Wave Output On Two 1/4" Jacks. The Frequency Range Is Variable From 20Hz to 24kHz, It Accepts A 1.2 To 5 Volt DC Input On A 1/4" Jack For External Frequency Control, and A 10 dB Output Pad Is Included To Provide A-10 dB Reference Signal. Other Optional Frequencies Are Made Available - Contact The Factory.