Get -20% discount on Emfit QS Wi-Fi, smart bed solution. Normal price 299 USD. It installs under bed mattress and measures heart rate, heart rate variability, breathing rate, all sleep classes including REM, and movement activity. Compelling web application scales from large to small screens. Recommened by professional athletes and researchers! Just go to our website http://www.emfitqs.com and to our webshop there. Use discount code "sensors". Valid June 27-30.