Makerb \/ Reprap Heating Plate Panel Hot Plate 3D Printer Accessories Description: There are six terminals, HEAT-, 12V, 5V, GND, GND, S16 HEAT-, +12V are all power supply terminal of heating S16 is signal terminal GND is ground wire of measure temperature terminal 5V is temperature measurement power supply terminal S16, GND, 5V are all use for measuring temperature. 12V, 24V for you to choose, all can be used during 12V - 30V Specification: Size: 230 x 150 x 1.5mm Color: black 230W Package included: 1 x Makerb \/ Reprap 3D printer heating plate