WIDELY USED: 60mm brushless dc fan; design to cool inverter, swtiching power supply, LED heat sink, amp rack, printer, computers, etc. or as a great replacement fan for various products DUAL-BALL MOTOR: Dual ball bearings rated at up to 50,000 hrs allows the fans to be mounted flat or upright. PBT material housing meets UL 94 standards for resistance to flammability 12 VOLT FAN: 9.84in (25cm) 2-wire terminated with XH2.54-2Pin connector for power supply (Red wire: positve, Black: negative); 2oz/57g EASY INSTALLED: Fan Size: 60mm L x 60mm W x25mm H, Mounting Hole Pitch: 57mm; Operating Voltage: 7V to 13.5V (overtake to 13.5V, it also can work; but not safe, even affects lifespan) DC AXIAL FANS: Rated Voltage: 12V DC | Current: 0.2 Amp | Power: 2.2 Watt | Noise: 36.1 dBA | Airflow: 22.7 CFM | Static Pressure: 0.21 In H2O | Fan Speed: 4500RPM