Do I have to be trained to use it?

You must be a certified scuba diver and should be completely familiar with all the operational features of the mask before diving it in open water. It is recommended that you first dive in a calm, clear body of water such as a swimming pool, if possible, to become completely familiar with all the operational features of the mask. While it's operation is not complicated, the diver should be able to adjust the regulator for optimal breathing as well as unmount, mount and clear the pod.