{"product_id":"12v-4-wire-pwm-fan-speed-controller-digital-temperature-display","title":"12V 4-Wire PWM Fan Speed Controller – Digital Temp Display","description":"\n\u003ch2\u003eGmarty 12V 4-Wire PWM Fan Temperature Control Speed Controller\u003c\/h2\u003e\n\u003cp\u003eTake full command of your PC chassis or server cooling system with this intelligent 4-wire PWM fan speed controller. Featuring a built-in digital display for real-time temperature and RPM monitoring, this compact controller automatically adjusts fan speed based on thermal readings — keeping your system cool and quiet without manual intervention.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntelligent PWM Speed Control:\u003c\/strong\u003e Supports 4-wire PWM fans with precise speed regulation across a 1–100% PWM range (±0.5%), balancing cooling performance with low-noise operation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDigital Temperature \u0026amp; Speed Display:\u003c\/strong\u003e Built-in readout provides real-time monitoring of both temperature and fan RPM — clear, intuitive, and always visible.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow-Temperature Auto Shutdown:\u003c\/strong\u003e Automatically powers off the fan when temperatures drop below the set threshold (supports fans up to 3A), reducing unnecessary noise and energy consumption.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Compatibility:\u003c\/strong\u003e Compatible with all standard 4-wire PWM fans used in PC chassis, CPU coolers, and server cooling systems. Supports reverse chronological fans and fan speeds up to 10,000 RPM (theoretical maximum: 30,000 RPM).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Easy to Install:\u003c\/strong\u003e Small footprint makes it ideal for integration into tight chassis spaces, with straightforward wiring and reliable connections.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDesign Supply Voltage:\u003c\/strong\u003e DC 12V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Voltage Range:\u003c\/strong\u003e DC 8–16V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCircuit Self-Consumption:\u003c\/strong\u003e \u0026lt;40mA (at 12V)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Fan Current:\u003c\/strong\u003e 3.5A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePWM Range:\u003c\/strong\u003e 1–100 (±0.5%)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePWM Frequency:\u003c\/strong\u003e 25 kHz (±1 kHz)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePWM Signal Amplitude:\u003c\/strong\u003e 5V (no load)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature Measurement Range:\u003c\/strong\u003e -9.9°C to 99.9°C\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature Accuracy:\u003c\/strong\u003e \u0026lt;1.2°C error (0–50°C range); \u0026lt;2°C error (full range)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterials:\u003c\/strong\u003e Plastic \u0026amp; Metal\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Contents:\u003c\/strong\u003e 1 × Fan Speed Controller Set\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant Note:\u003c\/strong\u003e This controller is designed exclusively for \u003cstrong\u003e4-wire PWM fans\u003c\/strong\u003e using a 25 kHz \/ 5V signal standard. It does \u003cstrong\u003eNOT\u003c\/strong\u003e support 2-wire or 3-wire fans. Please confirm your fan type before purchasing.\u003c\/p\u003e\n\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eYou May Also Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/10-in-1-multi-functional-bone-wrench-hex-socket-spanner-portable-repair-hand-tool-for-bicycle-motorcycle-furniture-assembly\"\u003e10-in-1 Multi-Functional Bone Wrench Hex Socket Spanner – Portable Repair Hand Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/16-in-1-multi-function-bike-repair-tool-portable-folding-hex-wrench-set-for-bicycle-motorcycle-furniture-maintenance-hand-tools\"\u003e16-in-1 Multi-Function Bike Repair Tool – Portable Folding Hex Wrench Set\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/3-in-1-precision-eyeglass-screwdriver-keychain-portable-mini-screwdriver-for-glasses-watch-spectacles-repair-hand-tool\"\u003e3-in-1 Precision Eyeglass Screwdriver Keychain – Portable Mini Screwdriver\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/personal-protective-equipment\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on personal protective equipment\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Will this PWM fan controller work with my 3-wire chassis fan?\u003c\/h4\u003e\n\u003cp\u003eA: No — this controller is designed specifically for \u003cstrong\u003e4-wire PWM fans\u003c\/strong\u003e only. It uses a 25 kHz \/ 5V PWM signal standard and cannot regulate the speed of 2-wire or 3-wire fans. Please verify your fan connector type before purchasing.\u003c\/p\u003e\n\u003ch4\u003eQ: What is the maximum fan current this controller can handle?\u003c\/h4\u003e\n\u003cp\u003eA: The controller supports fans with a current draw of up to \u003cstrong\u003e3.5A\u003c\/strong\u003e. The low-temperature auto-shutdown function works with fans rated at 3A or below. Always check your fan's rated current before connecting.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I use this controller outside of a standard PC chassis?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The wide operating voltage range (DC 8–16V) and compact design make it suitable for any cooling system that uses a 4-wire PWM fan — including servers, industrial equipment, custom PC builds, and other compact electronics requiring active thermal management.\u003c\/p\u003e\n\u003ch4\u003eQ: How accurate is the temperature reading on the digital display?\u003c\/h4\u003e\n\u003cp\u003eA: Within the 0–50°C range, the temperature measurement error is less than 1.2°C. Across the full measurement range (-9.9°C to 99.9°C), the error is less than 2°C, making it reliable for real-time system monitoring.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Will this PWM fan controller work with my 3-wire chassis fan?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No — this controller is designed specifically for 4-wire PWM fans only. It uses a 25 kHz \/ 5V PWM signal standard and cannot regulate the speed of 2-wire or 3-wire fans. Please verify your fan connector type before purchasing.\"}}, {\"@type\": \"Question\", \"name\": \"What is the maximum fan current this controller can handle?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The controller supports fans with a current draw of up to 3.5A. 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