Features: Designed for 12V 4-wire PWM fan/pump. Built-in DC-DC booster circuit. Supports standard 12V fan speed control and computer water cooling PWM pump speed adjustment. Recommended maximum output power: 7–8 watts (12V at 0.6A). Input port: USB Type-C female. Output: Standard PWM 4-pin fan connector. Built-in DC-DC boost circuit (boosts USB 5V to 12V). Built-in PWM signal generator for speed adjustment. Fan speed adjustment range: 0–100%. Turn the knob clockwise to increase speed. Turn the knob counterclockwise to decrease speed. Turn fully counterclockwise to disable output. Designed for use with 5V power sources such as USB chargers or portable batteries. Most common 5V power supplies deliver up to 2A; higher-capacity units are uncommon. A 12V/0.7A fan approaches the full 5V/2A input capacity. Due to its compact size, thermal performance is limited. Recommended output current: below 0.7A for short-term use, below 0.5A for continuous operation. Current draw varies proportionally with fan speed. Specifications: Input voltage: 5V Output voltage: 12V PWM frequency: ~25 kHz Output current: rated 0.5A, maximum 0.7A Input port: USB Type-C female Output: PWM 4-pin Speed range: PWM duty cycle 0–100% Adapter type: 1-to-3 fan splitter cable Material: PLA Color: Black Package Contents: 1 × PWM Speed Controller 1 × Power Supply Cable 1 × 1-to-3 Adapter Cable Note: Color may vary slightly due to screen settings and lighting conditions. Dimensional tolerance: ±1 mm.