This article presents a 2-cm legged microrobot, BHMBot, which achieves ultrafast untethered running speeds by combining bouncing length and frequency in its running gait. The BHMBot can run at a speed of 17.5 BL s\(^{-1}\) and achieve a turning centripetal acceleration of 65.4 BL s\(^{-2}\) with a power consumption of 1.77 W. The robot's locomotion is controlled wirelessly, enabling it to navigate complex trajectories such as circles, rectangles, and letters. The design and fabrication process of the BHMBot are detailed, including the electromagnetic actuator, transmission mechanism, and support frames. The robot's performance is evaluated through tethered and untethered tests, demonstrating its ability to carry payloads and perform tasks such as sound signal detection, navigating turbofan engines, and collaborating with drones. The BHMBot's high mobility and efficiency make it a promising platform for various applications, including search and rescue missions and structural inspections.This article presents a 2-cm legged microrobot, BHMBot, which achieves ultrafast untethered running speeds by combining bouncing length and frequency in its running gait. The BHMBot can run at a speed of 17.5 BL s\(^{-1}\) and achieve a turning centripetal acceleration of 65.4 BL s\(^{-2}\) with a power consumption of 1.77 W. The robot's locomotion is controlled wirelessly, enabling it to navigate complex trajectories such as circles, rectangles, and letters. The design and fabrication process of the BHMBot are detailed, including the electromagnetic actuator, transmission mechanism, and support frames. The robot's performance is evaluated through tethered and untethered tests, demonstrating its ability to carry payloads and perform tasks such as sound signal detection, navigating turbofan engines, and collaborating with drones. The BHMBot's high mobility and efficiency make it a promising platform for various applications, including search and rescue missions and structural inspections.