Specification: Working voltage: 3.3~30V (note that the positive and negative poles must not be reversed, otherwise it may burn) Frequency range: 1Hz~150KHz, accuracy about 2%. Motor speed control usually chooses 20KHz Operating range: 0-100%, 1% step Number of pulses: 1-9999, or infinity (displaying \"----\" represents infinity) Delayed shutdown time: 0.000s-9999s, the limit can be set to 1ms Positive and negative pulse width]: 0.000s-9999s, the limit small adjustable to 1ms Output power: less than 8A (MOS switching tube) Output amplitude: amplitude and supply voltage the same (OUT+ and V+ module internally directly connected) Product size: 79*43*30mm Product weight: 42g Features: 1. Direct drive for ED, motor, solenoid valve and other loads 2. Two modes can be selected. PWM mode one - frequency (continuous), duty cycle. Please note that the number of switching can not be adjusted in this mode, it is turned on and off constantly; PULSE pulse mode - positive pulse width time, negative pulse width time, on-delay start time, adjustable number of switching 3. With start-stop button to control start and stop 4. Wide voltage input 3.3-30V, 5.08mm terminal connection Package includes: 1*High Performance ZK-PP2K PWM & Pulse Generator Frequency Duty Cycle Adjustable Driver