This paper model is a Type 1 Phaser, the smallest, most basic weapon carried by Starfleet and other Federation personnel, based on American sci-fi entertainment franchise Star Trek, the paper model is created by Michael Haggard.
Type 1 phasers are typically carried when it would be inappropriate to carry a larger weapon, such as on diplomatic missions, or "undercover" work.
The type 1 has eight adjustable settings, ranging from stun to heat through disruption to disintegration. The 23rd century type 1 in use in the 2260 sincorporated a small flip-up sight. Several versions of the type 2 phaser incorporated a type 1 phaser into their design.
A 23rd century type 1 phaser did not possess sufficient power to harm asilicon-based lifeform such as a Horta. 24th century type-1s could be programmed to fire automatically at set intervals. [Source: wikia]
You can download this paper model template here: Star Trek: The Original Series - Type 1 Phaser Free Papercraft Download [Box] [Gavitex] [Ge.tt]