MOISTURE-PROOF: New trend of 12v dc moisture-proof fan to be designed for high humidity (80%)cooling vent project,verified test up to 4cm water for 4 hours. DUAL BALL BEARING: 120mm mini ac powered high cfm fan with long lasting dual ball bearing up to 60000 hours over 6 years. VARIABLE SPEED CONTROLLER: With 3v-12v speed controller to achieve different airflow(28-88CFM) and noise level needs(20-46.5dBA). 100V-240V PLUG: Increased maximum fan speed and enabled fan to be powered through an AC outlet; just plug it into a socket and start the fan. SPECIFICATION: Size: 120x120x25mm 4.72x4.72x0.98 inch Dual Ball Bearing Voltage: 3-12V Current: 0.09-0.5Amp Air Flow: 28-88CFM Noise: 20-46.5dBA Connector: DC 5.5x2.1mm Female. DIY COOLING PROJECT: 120mm high airflow fan equipped with double-sided metal grills to be used in cooling home entertainment systems ,electronics running at their ideal temp to prolong its life span. also can be widely used for ventilation.