One new old stock heavy duty metal housed relay Easy wall/under dash/under hood/firewall mounting (just add 1 or 2 screws to the top holes or use an existing bolt in vehicle) 12VDC coil (a 9v battery worked too) SPST normally open. Apply 12v to coil and the circuit closes Not sure of current rating but guessing hefty 30?40?50?Amp Universal type relay good for using 12Vdc to activate horns, sirens, lights, accessories for cars, trucks, vans, lawnmowers (pto clutch etc) Authentic vintage looking for vintage car,truck restorations. Not sure of brand, Marked " RBM" Large almost 2x3 inch The end 2 smaller terminals are coil, The other 2 are the contacts New old stock, high grade quality Probably American made. May have light dust or signs of storage.