HANDHELD,NEO MAGNET DYNAMIC UNI-DIRECTIONAL for Professional audio system, 16 oz, Mic: External, Cardioid, Dynamic The HDU250 is a dynamic microphone ideal for acoustically demanding environments. It features a heavy zinc die cast case with a rigid, low noise cable-mount system and a lockable silent reed switch. It has an extra low handling noise, floating shock-mounted Neodymium capsule.