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Masers, the microwave analogues of lasers, have seen a renaissance owing tothe discovery of gain media that mase at room-temperature and zero-appliedmagnetic field. However, despite the ease with which the devices can bedemonstrated under ambient conditions, achieving the ubiquity and portabilitywhich lasers enjoy has to date remained challenging. We present a maser devicewith a miniaturized maser cavity, gain material and laser pump source that fitswithin the size of a shoebox. The gain medium used is pentacene-doped inpara-terphenyl and it is shown to give a strong masing signal with a peak powerof -5 dBm even within a smaller form factor. The device is also shown to maseat different frequencies within a small range of 1.5 MHz away from the resonantfrequency. The portability and simplicity of the device, which weighs under 5kg, paves the way for demonstrators particularly in the areas of low-noiseamplifiers, quantum sensors, cavity quantum electrodynamics and long-rangecommunications.

`Maser-in-a-Shoebox': a portable plug-and-play maser device at room-temperature and zero magnetic-field