Next18 NEM662 Adapter Board 18Pin to Wires PAD Functions F2 = Function 2 M- = Motor - M+ = Motor + RL = Right Lights LS = Speaker +VE=V+ Rail R = Rail Right Rail L =Rail Left LS = Speaker F4 = Function 4 F3 = Function 3 FL = Front Light F1 = Function 1 Dimensions: Length 22mm Width 10mm Hole Diameter:2.5mm