"According to the Imec team, the most significant achievement is that the module does not require a crystal-based oscillator. Such oscillators are commonly used

"According to the Imec team, the most significant achievement is that the module does not require a crystal-based oscillator. Such oscillators are commonly used to precisely stabilize the frequency of radio signals and network protocol timing, but the Imec researchers instead created an on-chip mechanism that, in effect, uses the wireless network to calibrate itself. The lack of an off-chip crystal device made it possible to achieve the extremely small form factor needed for an ingestible."