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We report the discovery of KELT J041621-620046, a moderately bright(J$\sim$10.2) M dwarf eclipsing binary system at a distance of 39$\pm$3 pc.KELT J041621-620046 was first identified as an eclipsing binary usingobservations from the Kilodegree Extremely Little Telescope (KELT) survey. Thesystem has a short orbital period of $\sim$1.11 days and consists of componentswith M$_1$ = $0.447^{-0.047}_{+0.052}\,M_\odot$ and M$_2$ =$0.399^{-0.042}_{+0.046}\,M_\odot$ in nearly circular orbits. The radii of thetwo stars are R$_1$ = $0.540^{-0.032}_{+0.034}\,R_\odot$ and R$_2$ =$0.453\pm0.017\,R_\odot$. Full system and orbital properties were determined(to $\sim$10% error) by conducting an EBOP global modeling of the highprecision photometric and spectroscopic observations obtained by the KELTFollow-up Network. Each star is larger by 17-28% and cooler by 4-10% thanpredicted by standard (non-magnetic) stellar models. Strong H$\alpha$ emissionindicates chromospheric activity in both stars. The observed radii andtemperature discrepancies for both components are more consistent with thosepredicted by empirical relations that account for convective suppression due tomagnetic activity.

A Bright Short Period M-M Eclipsing Binary from the KELT Survey: Magnetic Activity and the Mass-Radius Relationship for M-dwarfs