TBEX-B, also known as E-TBEx B, is a 3U CubeSat satellite manufactured by UMI/SRII and launched on June 25, 2019, from LC39A at AFETR using the Falcon Heavy launch vehicle. The satellite has dimensions of 0.3 meters in length and 0.1 meters in diameter with a span of 0.5 meters. It weighs 4 kilograms both dry and at launch. TBEX-B is equipped with a tri-frequency radio beacon as its payload, named TBEx 2, for scientific research related to the ionosphere. The satellite's power system includes four deployable solar arrays and batteries. Its shape consists of a box structure with four panels, and it operates independently without any propulsion or attitude control systems specified in the data.