Don't worry! We are running a promotion for a free External Voltage Input Cable, and it automatically is added to your cart along with qualifying products. It will be credited when you checkout and is completely free for you. Here are the products included with this promotion: 14SG, 16SZ, 18SZ, 18SZ 70th Anniversary, 18MZ, R7014SB, R7008SB, R7006SB, R7003SB, R3008SB.