The KEPLER-4 (ANTILLES) satellite, also known as Antilles, is a 6U CubeSat configured in a Box + 2 pan shape, manufactured by KEPLER/UTIAS and owned by KEPLER. It was launched on September 28, 2020, from the PLMSC launch site using Soyuz-2-1B as the launch vehicle. The satellite weighs 15 kg at launch and has a dry mass of 15 kg. Its dimensions are 0.3 meters in length, 0.2 meters in diameter, and spans 0.7 meters. It is equipped with an SDR and narrowband communications payload for its mission to support M2M/IoT communication purposes. The satellite's power system consists of solar cells and batteries.