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Noibat is a lavender bat-like Pokémon. It has two clawed fingers on each wing and two long toes on each foot. Noibat's hips and chest are covered in black fur. It has large yellow eyes, two purple teardrop-shaped spots on the front of its face, and large teardrop-shaped ears that resemble loudspeakers. When its mouth is open, two pointed teeth can be seen on its lower jaw.
Noibat is capable of emitting ultrasonic waves of 200,000 Hertz from its ears, which it can use to stun large creatures, immobilize prey, and determine the ripeness of fruit it enjoys eating. It also uses ultrasonic waves as a means to communicate with other Noibat.