4 Pack Vacuum Cleaner HEPA Filters for Cyclonic Series RO3753EA RO3731EA RO3786EA 1. The product is made of high-quality materials with guaranteed quality<br> 2. The product is designed with ultra small size, and compact, with digital display<br> 3. Support four-wire fan speed regulation, product shipped with probe cable<br> 4. Support low-temperature shutdown of fans up to 3A, to directly turn off the fan power, and support reverse timing fans<br> 5. Stable product performance and long service life<br> Parameters:<br> Design power supply voltage: DC12V<br> Voltage range: DC8-16V (circuit working voltage, please pay attention to the fan voltage range)<br> Circuit self consumption: less than 40mA (tested at 12V)<br> Fan current: not exceeding 3.3A<br> PWM range: 1-100 (signal percentage non actual speed 0.5%)<br> PWM frequency: 25KHZ (plus or minus 1KHZ)<br> PWM signal amplitude: 5V (no-load)<br> Temperature measurement range: -9.9-99.9<br> Temperature measurement error: The error within the range of 0-50 is less than 1.2 , and the error in other ranges is less than 2<br> Note:<br> This speed controller only supports 4-wire PWM fans, and does not support 2-wire and 3-wire fans.<br> The attached cylindrical probe is more suitable for liquids and other situations. If you need to bring your own probe, please note that the probe resistance is 10K and the B value is 3950!<br> note: Different batches may have slight color differences or differences in the actual product, which does not affect use.<br> Material: PCB+electronic components<br> colour: Black<br> Package Contents:<br> 1 x Module<br> 1 x 3P input cable<br> 1 x probe cable<br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.