TENS devices have been used by many athletes in the past to deal with pain. eCookie is designed to relieve menstrual pain. It uses electrical impulses into the skin around the pain area to block transmitters that send pain signals to the brain. To use this device, simply download the eCookie app, put the electrode pads on your skin 15 cm apart, and use the app to choose your settings.
The app gives you access to 15 different settings and 4 preset modes. The device is compatible with iOS and Android devices.
This smart wearable device is expected to ship in August. You can find out more about it here.