Regenerative phaser
A regenerative phaser was a type of phaser weapon designed in the late-24th century by Starfleet. 

The TR-116 rifle was also considered as an alternative to this weapon, as it could have been used in any type of environment where a normal phaser was useless, such as inside energy dampening fields or radiogenic environments. The TR-116 however never entered production. ()

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de:Regenerativer Phaser
Directed energy weapons