The Neutron star Interior Composition Explorer (NASA) mission was launched on the 3rd June 2017 and installed on the International Space Station in low Earth orbit.
This instrument observes in the 0.2-12;0 keV band and reaches ~3 x 10⁻¹⁴ erg cm⁻² s⁻¹ in a 10 ks observation. Nicer is a non-imaging detector. It has a timing resolution of less than 300 ns and a spectral resolution of 85 eV at 1 keV and 137 eV at 6 keV.
For more information see https://heasarc.gsfc.nasa.gov/docs/nicer/