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