The Wurth Elektronik WR-PHD large bottom entry type dual row socket header has 4 pins and 2.54mm pitch. It has Nylon 9T insulator material, copper alloy contact material and gold contact plating. It has -40°C to +105°C operating temperature.Insulator flammability rating of UL94 V-0 Durability: 25mating cycles UL Approved E323964RoHS compliant