The Wireless Vertical IntekView mouse for Right Handed was conceived to reduce the risk of pain conducive by arm twisting motion during the use of a classic mouse. To prevent injury, the hand must completely be relaxed. Fingers must also be relaxed and the position of the hand halfway between a closed fist and an extended hand. The shape of the IntekView mouse wireless supports your hand in a completely relaxed position. It eliminates the twisting of forearm and the tensing of tendons. It was also noted to suit hands from the largest to the smallest