Module features: 1. Dual mode operation with a 0.1% duty cycle in good model; includes a lock function to prevent incorrect operation; 2. Frequency and duty cycle displayed clearly on LCD; adjusted via encoder potentiometer for easy and precise control; PWM output frequency and duty cycle can be set independently; 3. Module description: PWM output with independent frequency and duty ratio adjustment; 4. Upper and lower limits for duty cycle can be set; KPWM switch allows one-key control to turn PWM output on or off; 5. Wide frequency range with high precision; supports serial communication; Model: XY-KPWM Normal mode: Frequency range 1 Hz to 150 KHz, duty cycle range 1%; Good mode: Frequency range 1 Hz to 15 KHz, duty cycle range 0.0% to 0.1%; Frequency ranges are divided into four bands with automatic switching: 1. XXX (no decimal point): minimum unit 1 Hz, value range 1 Hz to 999 Hz; 2. X.XX (decimal point in tenths): minimum unit 0.01 KHz, value range 1.00 KHz to 9.99 KHz; 3. XX.X (decimal point in hundredths): minimum unit 0.1 KHz, value range 10.0 KHz to 99.9 KHz; 4. XXX (decimal point in thousands): minimum unit 1 KHz, value range 100 KHz to 150 KHz; Example frequency display: - 100 indicates PWM output of 100 Hz pulse; - 54.1 indicates PWM output of 54.1 KHz pulse; - 124 indicates PWM output of 124 KHz pulse; All parameters are saved when powered off; Specifications: - Operating voltage: 3.3 V to 30 V; - Frequency range: 1 Hz to 150 KHz (normal mode), 1 Hz to 15 KHz (good mode); - Frequency accuracy: approximately ±2% within each range; - Load capacity: signal output current approximately 5 mA to 30 mA; - Output amplitude: PWM amplitude equals supply voltage; - Operating temperature: -20°C to +70°C; - Material: plastic; - Color: grey black; Package Contents: 1 x Signal Generator Note: The package includes only the items listed above. Other accessories are not included. Note: Light reflection and differences in display screens may cause slight variations in the color of the item as shown. Measurement allows an error of +/- 1-3 cm.