David's myotis resembles other mouse-eared bats. The countries listed by EUROBATS represent only part of its range.
Its back is dark brown, with golden hair tips sometimes present. The ears and muzzle are also dark; it resembles the whiskered bat, Myotis mystacinus, but is described as slightly larger.
During warm-season surveys of the Daurian steppe in 2008–2019, 32 individuals were captured at cliffs beside Lake Ulin in Russia and one in rock fissures on Erhat-Ula Mountain beside the Duchiyn-Gol River in Mongolia. In March 2023, nine hibernating individuals were identified in Soktuy-Milozanskaya Cave in southeastern Transbaikalia: four males and five females.
An extinction-risk assessment has not been added yet.