How does Bellabee accomplish similar results as NFB without targeting a specific frequency for a specific brain site or side?

Though the brain has different areas and parts, they are all connected through networks and work in synchronization to achieve a goal or execute a task. For example, when you look at an object the Occipital lobe gets involved. When you compare it to another object the Temporal lobe gets involved since this is where memory is stored. If you reach for the object the Sensory-Motor cortex gets involved since it controls your motor functions. If you touch the object the sensory perception activates to fine-tune your movement and associated senses to help you reach the goal at hand. Meanwhile, the Cerebellum regulates the entire process.

Since the cerebellum fine tunes every action of the brain (higher mental functions, cognitive, emotions, sensory, motor) to accomplish a task in the most efficient manner, a device placed against the cerebellum, while emitting electromagnetic pulses within the natural frequency range of brainwaves, will help the cerebellum modulate the brain towards the correct frequency. As the cerebellum is connected to all other parts of the brain through nerve tracts, it can send and receive signals to and from (those parts) and influence the required part/s of the brain. It can even influence the body using the same neural pathways.

Bellabee uses a neuroscience phenomenon called “Brain Entrainment (BWE)” in this regard. Also known as “Brainwave Synchronization” and “Neural Entrainment”, it refers to the capacity of the brain to naturally synchronize its brainwave frequencies with the rhythm of periodic external stimuli. Brainwave Entrainment causes brainwave frequencies to synchronize with a periodic stimulus such as the frequency produced by Bellabee corresponding to the intended brain-state. The brainwave entrainment effectively “pushes the entire brain into a certain state”. Brainwave entrainment works for almost everyone. It is a great way to guide your mind into states that you might usually have difficulty achieving.
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By focusing the pulse at back of head where cerebellum is located, Bellabee conveys the modulated frequencies to reach other parts of the brain. This generated pulse acts maximally where the said frequency correction is required, just like when we take medicine, it absorbs through the blood and reaches every part of the body but works at the place where it is needed.