For PWM Fan Speed Controller 12 Volt 3 Amp with Temperature and Speed Display

For PWM Frequency: 25kHz (±1kHz). for PWM Signal Amplitude: 5V (no-load). The signal specification is 25kHz, 5V. Due to the influence of multiple factors such as display brightness and light brightness, the actual color of the product may be slightly different from the picture shown on the website.

eBay