Ramps 1.5 or 1.6 control board for your option. The difference is Ramps 1.6 has new 2pin connectors which are more simple and convenient to connect, and will not be burnt easily.Besides, Ramps 1.6 has a heatsink above MOS tube for better heat dissipation. And the power of Ramps 1.6 is larger than Ramps 1.5. Just choose according to your practical needs. Features: The control board can be connected to LCD and other parts. I2C and SPI pins are available for future expansion. Supports 2 motors to connect to Z Prusa Mendel. There are heater and fan MOSFET outputs and 3 thermistor interfaces. The LED light will be on when the heater has output. 5A additional security, and component protection when fusing together. Heated bed controls additional 11A fuses. Compatible with 5 Pololu stepper drive board. Design of Pololu plate pin socket can be easily replaced or removed for future design. Servo connectors are used for connecting limit stops, motors and light-emitting diodes. These connectors are gold-plated and have a rated current of 3A, which is very compact. Note: Size and color may be slightly different because of manual measurement and different lighting conditions, please in kind prevail. Thanks for understanding. Specifications: Type: RAMPS 1.5/ RAMPS 1.6 (Optional) Material: PCB Patch MOS Tube: B55NF06 Item Size: 101.5 * 60.5mm / 4.00 * 2.38in Package Size: 16 * 11 * 3cm / 6.30 * 4.33 * 1.18in Package Weight: 66g / 2.33oz (1.5 Base); 71g / 2.49oz (1.6 Base) Package List: 1 * RAMPS 1.6 Control Board 1 * Pouch of Jumper Caps 1 * Heatsink