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We propose a two-component dark matter explanation to the EDGES 21 cmanomalous signal. The heavier dark matter component is long-lived whose decayis primarily responsible for the relic abundance of the lighter dark matterwhich is millicharged. To evade the constraints from CMB, underground darkmatter direct detection, and XQC experiments, the lifetime of the heavier darkmatter has to be larger than $0.1\, \tau_U$, where $\tau_U$ is the age of theuniverse. Our model provides a viable realization of the millicharged darkmatter model to explain the EDGES 21 cm, since the minimal model in which therelic density is generated via thermal freeze-out is ruled out by variousconstraints.

Two-component millicharged dark matter and the EDGES 21cm signal