If emotions are getting the better of you while trading online, The Rationalizer may be just the thing to tell you when it's time to take a break.

The prototype unveiled by Netherlands-based Philips Electronics and ABN AMRO aims at sensing day traders' stress levels so they can time-out, wind down and re-consider their actions, the companies said on Tuesday.

Users wear a device called the EmoBracelet that senses stress and makes an accompanying lighted bowl, or EmoBowl, change color and flicker from yellow to red as emotions become more intense.

Researchers at Philips, Europe's biggest consumer electronics maker, say home investors often do not act purely rationally.

Their behavior is influenced by emotions, most notably fear and greed, which can compromise their ability to take an objective, factual stance, they said.

Although not in production, Geert Christiaansen, chief of business development at Philips Design, says the prototype is part of a broader effort by Philips to help people cope with stress and the technology could be used in an array of other products.

(Reporting by Harro ten Wolde; Editing by David Holmes)

Electronics ABN Amro