SPACEBEE-21, also known as SpaceBEE 21, is a CubeSat (0.25U) communication satellite launched by SWARM on September 3, 2020, from the FRGUI launch site using Vega as the launch vehicle. The spacecraft measures 0.025 meters in length and has a span of 0.9 meters with a diameter of 0.1 meters. It has a dry mass of 0.284 kilograms and operates on solar cells powered by batteries for its mission related to Machine-to-Machine (M2M) and Internet of Things (IoT) communication purposes. The satellite's shape is described as a box with two antennas, and it was manufactured in the United States under the ownership of SWARM.