Specification: 1. onboard SG3525A PWM control chip 2. on-board 78M05 regulator chip, providing a reliable reference voltage 3. onboard two precision adjustable resistors, R3 controls the duty cycle, R4 control frequency 4. on-board power indicator 5. the working voltage: 8 ~ 12V 6. Frequency Range 100HZ-100KHZ adjustable 7. Duty Cycle :0 - 100% adjustable 8.voltage : 5v 9. board size: 30.8 (mm) x18 (mm) Shipping Included: 2 x SG3525 PWM Controller Module Adjustable Frequency 100HZ-100KHZ (If the number of products received is incorrect, please contact us . we will refund or give you a replacement)

We highly appreciate all customers opinions to improve the selling, also if anything you unsatisfied, please contact us for probable best solution. Shipping Included: 2 x SG3525 PWM Controller Module Adjustable Frequency 100HZ-100KHZ (If the number of products received is incorrect, please contact us . we will refund or give you a replacement). onboard SG3525A PWM control chip. on-board 78M05 regulator chip, providing a reliable reference voltage. the working voltage: 8 ~ 12V.