Killer Rezzy sells reservations for restaurants they partner with as well as restaurants they have no business agreement with.

Shooting can be heard," Mohammed Rezzy, a Tibu representative, said referring to a Tibu area.

Killer Rezzy is a New York City-based restaurant reservation service for Manhattan, Brooklyn and the Hamptons.

The feature would add a specific set of harmonics to the sound depending on which type of waveshape one would select, from for instance, names like "Rezzy", "Parabola" & "Comb".

Some restaurants are bothered by Killer Rezzy selling reservations to their restaurant when free reservations can be made at OpenTable, Killer Rezzy has offered to remove restaurants upon request.