Features: brand new and high quality 5 temperature sensor interface inputs. 6 outputs (1 high current, 3 currents, 2 low currents). All other pins are led out to facilitate more function expansion. Drive with a high performance low conduction resistance Mos tube. Each output has an LED as an indication. PWM for DC output (heating tube, fan, etc.). Power supply:Dual power supply design to avoid mutual influence (12V power supply is strongly recommended).The hot bed part supports 11A current, 12V.Other parts of the circuit, 5A, 12V.In order to reduce the high temperature generated by the large current on the Me ga Controller board, it is recommended to add a 12V cooling fan. Support 6 A4988 16 subdivision stepper board The servo gear expands the interface to facilitate the automatic leveling function. Using the same CPU as ArduinoMEGA, Atmega2560 is used as the main control chip, and with high-performance USB chip CP2102, it can be for all RAMPS related firmware. With LCD expansion interface, you can connect Chinese LCD screen and SD expansion board to achieve offline printing. Package Includes: 1 x 3D Printer Motherboard Specifications: Material: PVC Size: approx. 135x75mm/5.31x2.95in note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.