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Feature 1.Size (LxHxW): 6 x 2.3 x 3.1 cm/ 2.5" x 0.9" x 1.2" Voltage: 12V-50V (12-24VDC recommended) 2. Connect Power to power source, please note the anode and cathode. 3. Connect Hotbed to heated wire, please note the anode and cathode. 4. Connect digital control signal to Gnd, D8. 5. Connect the control signal of Ramps1.4 or MKS MOSFET to -Bed+ 6. Choose one signal group to connect. 7. If you don't know how to install, please contact us or find the related link in youtube, thanks Please kindly note: Pay attention to polarity Only can choose 3 or 4 signal group Package included: 2 x 3d printer heated bed power module; 2 x connection cable for input signal