Emergency transport unit
The emergency transport unit was a portable transporter device developed by Starfleet in 2379. The small device was designed to provide an individual with a single, one-way transport in order to escape a potentially dangerous situation.

The first successful field test of the emergency transport unit occurred during the Battle in the Bassen Rift, when Data used the prototype to beam Jean-Luc Picard to the  before destroying the thalaron weapon aboard the Reman warbird Scimitar. ()

See also 
 Emergency transporter
 Emergency transporter armband
 Site-to-site transporter

de:Mobiler Notfalltransporter
fr:Unité de téléportation d'urgence
Transporter technology