Bearing: 2 Ball Bearing with Special Designed IC Inside Size: 120*120*25mm Model:4710KL-04W-B59 MTTF: 180000 hours Rated voltage: 12V Operating voltage range: 6V - 13V Current: 0.72A Speed: 2800rpm Noise: 41.5dBA Air volume: 114.7CFM The characteristics of this fan: 1: double ball, super durable, 180,000 hours of service life 2: Suitable for 7*24 hours without shutdown 3: Large air volume, suitable for high-end equipment such as servers