Description: If your total power usage is 240W and you have 12V power supply, then it means at least 20A is needed (20X12=240W). As controller board is only capable of 15A this setting will not work. To make it work, you need this extra power module. This module can be used in both Chitu motherboard, and other open 3D Printer motherboards. This module under normal cooling is found stable work situation at I (Max) = 25A, the using current should not exceed 25A. If you intend to use heated bed with your 3D printer that uses a 12V power supply, then this module is recommended, else it may cause excessive current during times which may burn the connectors on the controller board. Features: A general add-on heated bed power expansion module high power module for 3D printer. Can be used in both Chitu motherboard and other open 3D printer motherboards. Helps 3D printer equipped with the controller board (capable of max 15A) become more powerful. With this add-on module to board lead the maximum current up to 25A. If you intend to use heated bed with your 3D printer that uses a 12V power supply, then this module is recommended, else it may cause excessive current during times which may burn the connectors on the controller board. Specifications: Color: Black Max Current: 25A(Enhance heat dissipation) Size: 6 x 5 x 3.1cm / 2.36 x 1.97 x 1.22 Weight: 40g(approx.) Package Includes: 1 x Heat Bed Expansion Power Module(motherboard is not included) Note: 1. Please allow 1-3mm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.