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Parameter: Frequency adjustment range: 1-160KHz Duty cycle adjustment range: 0-100% adjustable Working voltage: 4V~30V Frequency adjustment range: 1Hz~160KHz Frequency accuracy: 2% Output current: 5~30mA Output amplitude: 4V~30V Setup steps: 1. Press “SET”, if the frequency number flashes, then set the frequency with the UP or DOWN button. 2. Press “SET”, if the duty cycle number flashes, then set the duty cycle by pressing the UP or DOWN button. 3. Press "SET" to exit the setting. 4. Press and hold “UP” or “DOWN” to increase or decrease quickly.