Among others, the SMOK neckline is outfitted with a microphone to automatically record any intimate sounds or whispers. Recorded sound memories can be played back by raising the SMOK arm and bringing the hand close to the ear. The cuff has a small speaker that whispers back the recorded sounds.
Source: Berzowska, J. and Coelho, M. 2006. SMOKS. In Extended Abstracts on Human Factors in Computing Systems (CHI’06). ACM Press, 538–543.
http://www.xslabs.net/work-pages/smoks.html
