Fangrui Product Details Adopting Icl8038 And High-speed Operational Amplifier, With Higher Accuracy;it Can Output Sine/triangular/square Wave/forward And Reverse Sawtooth Waveforms; Frequency Range: 5hz~400khz; Duty Cycle Range: 2~ (adjustable); Support Dual Power Amplifiers Without Blocking Capacitors, Ensuring High And Low Frequency Signal Distortion; Adjustable Frequency And Amplitude;frequency Adjustment Has Coarse And Fine Tuning Functions;all Are Through-hole Components, Easy To Install. Different Batches May Have Different Appearance, Which Does Not Affect Use.depending On The Batch, The Colors Of Electronic Components/knobs, Etc. May Be Different, Which Does Not Affect Use. Parameter: Power Supply Voltage: 12v~15v Frequency Range: 5hz~400khz (adjustable) Duty Cycle Range: 2~ (adjustable) Low Distortion Sine Wave: Low Temperature Drift: 50ppm/ C Output Triangular Wave Linearity: 0. Dc Bias Range: -7.5v~7.5v Output Amplitude Range: 0.1v~11vpp (working Voltage 12v) Interface Description: 1. Squ: Output Rectangu