The ErgoFeel Vertical Ergonomic Mouse is designed to make using a mouse comfortable again. It does this by changing the posture of your hand and forearm. It supports your hand in an upright neutral position. This position is optimal for reducing both the tension and activation of your forearm muscles. By reducing the tension and activation of your forearm muscles you will notice an immediate difference in how your hand and arm feels when using your mouse. Firstly it just feels more comfortable and natural. And that's because it is. Secondly you will notice that you don't get that aching pain in your wrist hand or forearm. Aches and pains are completely resolved with the ErgoFeel Vertical Ergonomic Mouse. But best of all you can use your mouse for longer periods without that annoying aching pain. And that means no more rubbing your aching hand or using anti inflammatory gels to mask the problem. No more struggling through reports assignments or work. It's unavoidable in this day and age of work. But you've probably come to realise conventional computer mice are horrible to use. Sure they get the job done but they cause you aches and pains.