3-12V Wide Voltage Adjustable Output This variable power adapter delivers DC 3V-12V continuously adjustable output with max 3A 36W power, perfectly regulating speed, airflow/water flow, noise level and power consumption of your 12V cooling fans and water pumps. Compatible with 2-pin, 3-pin, 4-pin fans and DC5521 port devices for flexible DIY cooling control.

35cm 4-Pin Fan Splitter Cable Included Comes with a 35cm DC5521 female to dual 4-pin fan splitter cable, supporting simultaneous power supply and speed adjustment for multiple cooling fans or pumps. Ideal for PC cases, NAS, servers, AV cabinets and water-cooling systems, expanding your cooling setup easily.

Comprehensive Safety Protection & Premium Build Built-in IC smart chip and thickened pure copper wire, with over-charge, over-current, over-voltage, short-circuit and temperature protection. Fireproof housing ensures safe long-term use; the adjustable knob features an ON-OFF switch, plus an indicator light with brightness variation to show working status intuitively.

Universal Input & Widely Compatible Port AC 100-240V wide-range input supports global power grids; standard DC 5.5×2.5mm plug (compatible with 5.5×2.1mm) matches most fan and pump power ports. Perfect for DIY electronic projects, router cooling, cabinet ventilation, water-cooling equipment and more 12V low-voltage devices.

Versatile Application for All Cooling Scenarios Achieve perfect balance of noise, power and temperature for your devices. Widely used for PC gaming cases, home NAS storage, network servers, AV audio-visual cabinets, water-cooling systems, DIY electronics, routers and small industrial equipment cooling.