ITEM NAME:1pc Standard SG3525 PWM Controller New Module Adjustable Frequency Module 100% brand new and high quality. Quantity: 1pc Color: as picture show Size: 30mmx18mmX18mm/1.17" x0.52"X0.52"(inch) (approx) Specifications: 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: 8V ~ 12V. 6.Oscillator for frequency bubble Wai find: 100-10KHz. 1pc SG3525 PWM Controller Module..Quantity: 1pc. Oscillator for frequency bubble Wai find: 100-10KHz. Also note that monitor settings may vary from computer to computer and may distort actual colors. If you have any problems, we are very glad to help you.