Electric Hinge specifically manufactured with rounded corners for use with storefront system's stainless steel hinges. The brushed stainless steel finish matches the manufacturers hinges that are used so all the hinges will match. The electric hinges have 4 wires, 2 each 18 gauge wires rated at 5 amps and 2 each 26 gauge wire for signal if needed. 3 year warranty. UL listed.