  The 7-Dimensional Telescope (7DT) is a multi-telescope system designed to
identify electromagnetic (EM) counterparts of gravitational-wave (GW) sources.
Consisting of 20 50-cm telescopes along with 40 medium-band filters of 25 nm
width, 7DT can obtain spectral mapping images for a large field of view (~1.25
square degrees). Along with flexible operation, real-time data reduction, and
analysis, the 7DT's spectral mapping capability enables 7DT to follow up GW
events quickly and discover EM counterparts. Among 20 planned telescopes, 12
units are deployed at the El Sauce Observatory located at Rio Hurtado Valley in
Chile. Since we obtained the first light of 7DT in October 2023, we started its
commissioning procedures including examination of bias levels, master flat
production, and spectrophotometric standardization. In this talk, we present
7DT instruments and their set-up, commissioning procedures, and data
characteristics of 7DT along with our three-layered surveys which are assumed
to be initiated in early 2024.
