Israel’s Livia has developed a wearable device that provides instant relief from cramps, and lasts up to 15 hours on a single charge.  The device uses electrical pulses to block pain receptors.  Female journalists given a free Livia device have described it as “a life-changing technology”.

http://www.timesofisrael.com/the-israeli-invention-that-reverses-the-curse-of-eve/