New Delhi, Nov. 9 -- Honor appears to be giving its upcoming Honor 700 series smartphones an unusual addition: a secondary display on the back that could do more than show notifications. The small screen may also help users monitor their heart rate and blood oxygen levels, according to the brand's latest teaser.

The company has already revealed the designs of three upcoming models, the Honor 700, Honor 700 Pro and Honor 700S. All three feature a secondary display integrated into the rear camera module, setting them apart from conventional smartphone designs.

Honor has not officially confirmed the health-monitoring capabilities of the screen. However, its latest promotional image shows heart rate and blood oxygen readings, suggesting tha...