OEM Cooling Fan for the IdeaPad S540-14IML and ThinkBook 14s-IML 14s-IWL laptop series, this is the cooling fan for CPU processor. If your PC fan is running very loud or not functioning then a replacement may be needed. The fan uses an integrated flex cable to connect to the motherboard. The cable connects via 4-pin connector making it a plug and play replacement module, NO soldering is required. Specifications: Direct Current: DC 5V / 0.5A Color: Black Connection: 4-pin 4-wires Wire Length: 3.60 cm/1.50-inches Manufacturer Part Number(s): FLDU DFS5K12304363Q, BL0110401350 Reference list of compatible with Laptop models: - IdeaPad S540-14 series: S540-14IML (Type: 81NF) - ThinkBook 14s series: 14s-IML (Type: 20RS, 14s-IWL (Type: 20RM) - Yangtian Wei 6Pro K4-IWL What's in the box: 1x CPU Cooling Fan (Right side) CAUTION: The thermal paste and Screw NOt included, Please retain the original screw for the installation of this part.