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a comically small, 1.22kW thermoelectric fission reactor

Essentially, just a nuclear soup can

Weights only 544 grams and fits in the palm of your hand, while also capable of powering around 8 refrigerators
Has a radius of 4.4 cm and a height of 10.9 cm
Also, it might just so happen to be a slight radiation hazard for the crew, making it more fitting to be used in drones