Recently, researchers at Zhejiang University invented an electrically-driven perovskite laser. It is a dual-cavity laser created by integrating a low-threshold perovskite single-crystal microcavity sub-unit with a high-power microcavity perovskite LED sub-unit, featuring a vertically stacked multi-layer structure. Operating under electrical excitation, the device shows a lasing threshold of 92 A/cm2, which is an order of magnitude lower than that of the best electrically-driven organic lasers. The perovskite laser shows superior stability compared to the organic lasers, and can be rapidly modulated at a bandwidth of 36.2 MHz. This new class of lasers may find their use in on-chip data transmission, computation and biomedical applications.