Box is HUGE. Does not need to be so large. Box is NOT weather proof or water proof. Can not lock the lever into position. Inlet holes have cheap brittle plastic entry covers. Not weather tight. Front cover is not attached and has to be carefully removed when opening. Held closed by two small screws that will rust quickly. Cover is able to accidentally and easily make contact with live circuit when removing cover. Box steel is very thin and flimsy. No padding in shipping box and handle bent from being bounced around in shipping box. Blades are thicker than other chinese boxes.

Excellent communication from seller. Item exactly as described. Shipping was delayed due to California fires, seller communicated issue immediately. Very pleased with product. Extremely pleased with shipper's diligence.

It's overall a simple piece of hardware. It's display is easy to read and the setting menu is basic and easy to use. The terminals are solid. I only gave it a 3star on "Easy to use" because the instructions have no information on wiring it for North American 240v which it is advertised to be and is capable of. Most people would clearly figure out to substitute their L2(line 2) to the N(neutral) terminal on the AC connections, but others wouldn't understand and/or would want reassurance of this through documentation. Aside from that it is a sound little transfer switch and performs great.

I used this extension to be able to freely place my solar panels wherever needed. Well made and came with some nice extras.