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 you can lie in bed and hear the realtime heartbeat of your loved one. The result is an intimate interaction between two lovers, regardless of the distance between them," the company said on its website.
Pillow Talk began life in a slightly different form as a university product of founder Joanna Montgomery in 2010. The project has since received more than 750,000 views on Youtube and worldwide attention, the company said.