BT 4.0

 

http://www.dcrainmaker.com/2012/07/the-current-state-of-bluetooth-smartlow.html

http://www.kickstarter.com/projects/alphaheartrate/alpha-the-holy-grail-of-heart-rate-look-ma-no-hand/posts/260526

http://www.mobile01.com/topicdetail.php?f=558&t=2865843&p=1

http://goods.ruten.com.tw/item/show?21202192113194