OEM Cooling Fan for the IdeaPad S540-13IML and ThinkBook 13s-IML 13s-IWL laptop series, this is the cooling fan for CPU processor and GPU Graphics card. 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 mainboard. 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 Manufacturer Part Number(s): CPU Part Numbers: FLDU DFS5K12304363Q, BL0110401350; Wire Length: 3.60 cm/1.50-inches GPU Part Numbers: FL05 DFS150305180T, BL0110401355; Wire Length: 7.70 cm/1.10-inches Reference list of compatible with Laptop models: - IdeaPad S540-13 series: S540-13IML (Type: 81XA) - ThinkBook 13s series: 13s-IML (Type: 20RR), 13s-IWL (Type: 20R9) - Yangtian Wei 6Pro K3-IWL What's in the box: 1x CPU Cooling Fan (Right side) 1x GPU Cooling Fan (Left side) CAUTION: The thermal paste and Screw NOt included, Please retain the original screw for the installation of this part.