1. Deafness Prevention, (2018) “World Health Organization.” Available [online]: http://www.who.int/deafness/en/.
2. Flex Sensor Datasheet, “Flex Sensor.” Spectra Symbol
3. ADXL335 datasheet, (2015) “ADXL335.” Spark Fun
4. Arduino Nano Datasheet, (2012) “Arduino CC.” Arduino Nano
5. HC-05 Datasheet, (2010) “Bluetooth to Serial Port Module-HC-05.” Itead Studio