ErgoFeel Vertical Ergonomic Mouse - Left Handed - WiredThe 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