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The Kerr/CFT correspondence has been established to explore the quantumtheory of gravity in the near-horizon geometry of a extreme Kerr black holes.The quantum gravitational corrections on the near-horizon region may manifestin form of a partially reflective membrane that replace the horizon. In suchmodification, the black holes now can be seen as a horizenless exotic compactobject (ECO). In this paper, we consider the properties of Kerr-like ECOs innear-extremal condition using Kerr/CFT correspondence. We study the quasinormalmodes and absorption cross-section in that background and compare these byusing CFT dual computation. The corresponding dual CFT one needs to incorporatefinite size/finite $N$ effects in the dual CFT terminology. We also extend thedual CFT analysis for higher spin perturbations such as photon and graviton. Wefind consistency between properties of the ECOs from gravity sides and from CFTsides. The quasinormal mode spectrum is in line with non-extreme case, wherethe differences are in the length of the circle, on which the dual CFT lives,and phase shift of the incoming perturbation. The absorption cross-section hasoscillatory feature that start to disappear near extremal limit. The particlespin determines the phase shift and conformal weight. We also obtain that theecho time-delay depends on the position of the membrane and extremality of theECOs.

Near-extremal Kerr-like ECO in the Kerr/CFT Correspondence in Higher Spin Perturbations