This replaces the Heil Heritage
Frequency response: 60Hz - 18 kHzPolar pattern: cardiodImpedance: 600 Ohm balancedOutput level: -52.9dBEnd fire generating element: 1-1/8" diameter dynamicPolarity: Pin 2+Magnet structure: Neodymium, iron, and boronCase structure: SteelChrome finishAluminum carrying caseDimensions: 4" W x 6" LStem height: 2-3/4"Weight: 1.65 lbs.