This transfer switch has a L14-30 male power inlet and dual wattmeters to help you balance generator loads to prolong generator life. Includes two 15-amp 1-pole breakers, two 20-amp 1-pole breakers, one 2-pole 20 amp breaker, and one 2-pole 30-amp breaker. If your load center is in the garage, you'll just need the transfer switch and cord. But if your load center is in your basement, you'll need to install the power inlet box to connect your generator outside. A 60-amp 2-pole main breaker is required in existing load center (not included). UL 1008 Listed. Protected by US Patent 6,861,596 B2 and other patents pending. Transfer Switch dimensions: 9.25 W x 11.125 H x 3.375 D.