The wristband picks up the wearer’s heartbeat and transmits it via Bluetooth to the iOS or Android app. You are connected directly to your partner via the app; you will receive his/her heartbeat, and they will receive yours. By plugging in your headphones or the pillow speaker (available separately) you can lie in bed and head the realtime heartbeat of your loved one. The result is an intimate interaction between two lovers, regardless of the distance between them.
Source: http://blog.joannamontgomery.com/2010/04/pillow-talk-my-degree-project.html
http://littleriot.com/pillowtalk/
