Dimension of outer the frame is 30mm(L) x 30mm(W) x 7mm(H) / The size of fan in inch is 1.18in(L) x 1.18in(W) x 0.28in(H); The center to center distance beween the mountiong holes is 24±0.3mm/0.94in. Operating Voltage Range5.5V to 13.8V. (overtake to 13.8V, it can also work. but not safe, and seriously affects lifespan of fan.) Rated Current: 0.08Amp; Speed: 9500RPM ; Air flow: 2.98CFM ; Noise: 29dBA Connector: Ph 2.0 2PIN; Lead wire: UL Type (+): Red wire ; (-): Black wire. This is a two wire cooling fan; Bearing Type: Sleeve Bearing ; Life: working up to 35000h at 25 degrees. Package include: 2 x 30mm cooling fan; 4*M2.5x10mm screws & nuts( the fan is mounted by screws.)