  Clusters of galaxies are used to map the large-scale structures in the
universe and as probe of universe evolution. They can be observed through the
Sunyaev-Zel'dovich (SZ) effect. At this respect the spectro-imaging at low
resolution frequency is an important tool, today, for the study of cluster of
galaxies. We have developed KISS (KIDs-Interferometer-Spectrum-Survey), a
spectrometric imager dedicated to the secondary anisotropies of the Cosmic
Microwave Background (CMB). The multi-frequency approach permits to improve the
component separation with respect to predecessor experiments. In this paper,
firstly, we provide a description of the scientific context and the state of
the art of SZ observations. Secondly, we describe the KISS instrument. Finally,
we show preliminary results of the ongoing commissioning campaign.
