That is amazing. Wish every range would outfit with them. Wonder if it makes sense to get one.
"Under the law of nature, all men are born free; every one comes into the world with a right to his own person, which includes the liberty of moving and using it at his own will. This is what is called personal liberty, and is given him by the Author of nature, because it is necessary for his own sustenance." -- Thomas Jefferson: Legal Argument, 1770. FE 1:376