1. cc2531 zigbee chip. http://www.ti.com/lit/ds/symlink/cc2531.pdf. cc2531 zigbee chip. http://www.ti.com/lit/ds/symlink/cc2531.pdf.
2. Github repo. https://github.com/jinhuang01/CLIO. Github repo. https://github.com/jinhuang01/CLIO.
3. Long range low power rf transceiver 860-1000 mhz with lora technology. https://www.semtech.com/products/wireless-rf/lora-transceivers/sx1272. Long range low power rf transceiver 860-1000 mhz with lora technology. https://www.semtech.com/products/wireless-rf/lora-transceivers/sx1272.
4. Nsf: Hearables challenge. https://www.nasa.gov/feature/nsf-hearables-challenge. Nsf: Hearables challenge. https://www.nasa.gov/feature/nsf-hearables-challenge.
5. St spbt2632c2a bluetooth module. http://www.st.com/web/en/resource/technical/document/datasheet/DM00048919.pdf. St spbt2632c2a bluetooth module. http://www.st.com/web/en/resource/technical/document/datasheet/DM00048919.pdf.