It's a jQuery plugin, whitch is used for web, used for almost any switch affect.
$("selector").powerSwitch({ /* APIs */ });
Test Page: http://rawgithub.com/zhangxinxu/powerSwitch/master/index.html
Demo Pages: http://rawgithub.com/zhangxinxu/powerSwitch/master/demo/_html/index.html
API Document: http://rawgithub.com/zhangxinxu/powerSwitch/master/api/index.html
You can visit here to get more information.