 Three years later, four additional satellites were launched in March 2018, and in April 2019, the final four were launched to bring the constellation to 20 satellites, including the three current backup satellites which are used as in-orbit spares.In September 2017, SES announced the next generation of O3b satellites and placed an order for an initial seven from Boeing Satellite Systems.Expected to launch in 2021, the O3b mPower constellation of MEO satellites for broadband internet services will "be able to deliver anywhere from hundreds of megabits to 10 gigabits to any ship at sea" through 30,000 spot beams.