$129 Mug Promises To Keep Your Coffee At Exactly The Right Temperature Scott Lush EquipmentVideos November 12, 2015 If you spend $1,000 a year on good coffee why would you let it cool in a cheap paper cup, losing flavor quickly? This invention seeks to remedy that. This new temperature adjustable mug keeps your coffee at a constant temperature that you choose. No wonder the company EmberTech is approaching 500% of its Indiegogo fundraising goal with over 1,300 backers. The video is hilarious too.