There is a Plus and Minus sign on the connector.
Please do not plug the connector opposite way
ㆍMaterial : Metal
ㆍColor : Red
ㆍMax.rpm : 28000rpm
ㆍSuitable Voltage : 5V / Max. 7.4V
ㆍWire length : 18cm
ㆍDimensions : 3 x 3 x 1cm
ㆍWeight : about 13.7g
ㆍ1 x Cooling Fan