This is a self rescue type harness, meaning in the event of a fall, you can lower yourself down the tree, controlling the speed of the descent the whole time. You can practice with it as many times as you would like to, in order to get familiar with it, simply reset the device and use it again. Like new without original packaging. Has been taken a field twice but has never been deployed or used in a self rescue. Sell straight out or trade for other archery or hunting gear.