The C1000 is a cardioid/hypercardioid condenser

Condenser (heat transfer)

In systems involving heat transfer, a condenser is a device or unit used to condense a substance from its gaseous to its liquid state, typically by cooling it. In so doing, the latent heat is given up by the substance, and will transfer to the condenser coolant...

 microphone produced by AKG Acoustics

AKG Acoustics

AKG Acoustics is an Austrian manufacturer of microphones, headphones, wireless audio systems and related accessories for professional and consumer markets...

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It uses either phantom power

Phantom power

Phantom power, in the context of professional audio equipment, is a method for transmitting DC electric power through microphone cables to operate microphones that contain active electronic circuitry....

or an internal 9-volt battery for when phantom power is inconvenient or unavailable. This flexibility is also useful when using consumer recording gear that frequently lacks phantom power. The pattern is switchable with the addition or removal of an optional capsule attachment.