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Hypothetical particles with tiny electric charges (millicharged particles orMCPs) can be produced in electron-positron annihilation if kinematicallyallowed. Typical searches for them at $e^+e^-$ colliders exploit a signature ofa single photon with missing energy carried away by the undetected MCP pair. Weput forward an idea to look alternatively for MCP energy deposits inside atracker, which is a direct observation. The new signature is relevant fornon-relativistic MCPs, and we illustrate its power on the example of the$c$-$\tau$ factory, where we argued that the corresponding searches may bebackground-free. We find that it can probe the MCP charge down to$3\times10^{-3}$ of the electron charge for the MCP masses in ${\cal O}(5)$ MeVvicinity of each energy beam value where the factory will collect a luminosityof 100 fb$^{-1}$ in one year. This mass region is unreachable with the searchesfor missing energy and single photon.

On direct observation of millicharged particles at $c$-$\tau$ factories and other $e^+e^-$-colliders