PARAMETER --- working voltage DC 3.3-30V; frequency range 1Hz-150kHz; duty ratio range 0-100%; number of pulse 1-9999 or infinite; delay output time 0.000s-9999s. DUAL MODE --- the signal generator has 2 modes, PWM mode (default) & pulse mode. APPLICATION --- the signal generator module can be used to generate square wave rectangular wave signals for controlling DC motors or stepper motor driver; for servo motors, stepper motors, electric jaws, PLC pulses replacement, etc. PROTECTION --- with anti-reverse protection, 5.08mm terminal wiring. EASY TO OPERATE --- the signal generator can control start or stop, it can also connect the external switch to control the output signal ON/OFF. Parameter: Working Voltage: DC 3.3-30V, with anti-reverse protection. Frequency range: 1Hz~150KHz, accuracy about 1%. Duty cycle range: 0-100%, 1% stepping. Number of pulses: 1-9999, or infinite (display '----'stands for ). Delay output time: 0.000s-9999s, the minimum can be set 1ms. positive and negative pulse width length: 0.000s-9999s, the minimum can be set 1ms. signal loading capacity:less than 30mA. Output signal amplitude: amplitude is equal to the supply voltage. Dual Modes: PWM mode - frequency (continuous), duty cycle. Note that the number of pulses cannot be set in this mode, and the pulse is always sent; PULSE mode - positive pulse width time, negative pulse width time, delay start time, and number of pulses are adjustable. Colour: grey Material:plastic Size:71 x 43mm Package contents: 3 x PWM Pulse Generator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.