This is another helmet of normal appearance which will give off a magical aura if detected for. 

Any character wearing this device may teleport (q.v.) once per day, exactly as if he or she were a magic-user, i.e. the destination must be known, and a risk is involved. 

If a magic-user has access to this device, its full powers can be employed, for the wearer can then memorize a teleportation spell, and use the helm to refresh his or her memory so as to be able to repeat the spell up to 3 times upon objects or characters and still be able to personally teleport by means of the helm. 

As long as the magic-user retains the teleportation spell uncast, he or she can personally teleport up to 6 times before the memory of the spell is lost, and even then a usage of the helm remains as noted above.