A type-1 Phaser from 2367, specifically the mark V personal phaser.
A type-1 phaser was the smallest, most basic weapon carried by Starfleet and other Federation personnel. Type-1 Phasers were typically carried when it was inappropriate to carry a larger weapon, such as on diplomatic missions, or "undercover" work.
The Type-1 had eight adjustible settings, ranging from stun to heat through disruption to disintegration. The 23rd century type-1 in use in the 2260's incorporated a small flip-up sight, and was fired by a trigger on the bottom front of the unit. Several versions of the Type-2 Phaser incorporated a Type-1 Phaser into their design.
A low power variant of the Type-1 was also available. This variant only had three settings, from light to heavy stun. (TNG reference: Star Trek: The Next Generation Technical Manual)
In 2362, three unsolved homicides were committed by an assailant using a type-1 phaser on burn setting. In 2366, the murderer was determined to be Starfleet officer Dar Ableen. (SCE eBook: Security)
In 2369, Benjamin Sisko used one of these particular models of phaser in dealing with Bajoran terrorists placing bilitrium grenades in Deep Space 9's docking pylon 3. (DS9 video game: Crossroads of Time)
Connections
| Federation Starfleet hand-held weapons | |||
|---|---|---|---|
| Directed energy weapons | type-1 phaser/hand phaser | Sestra phaser I • Atalskes phaser III • Sestra phaser IB • mark V personal phaser | 
|
| type-2 phaser/phaser pistol | Sestra phaser II • Atalskes phaser IV • Sestra phaser IIB • mark VI battle phaser • phaser (Kelvin timeline) | ||
| type-3 phaser/phaser rifle | phaser rifle (23rd century) • mark VII phaser rifle • type III phaser rifle • compression phaser rifle • enhanced compression rifle • phaser rifle (Kelvin timeline) | ||
| miscellaneous | assault rifle • infinity modulator • isomagnetic disintegrator • laser pistol • laser rifle • neural disruptor • phase pistol • sniper rifle | ||
| Projectile weapons | compound grenade launcher • photon burst • quantum burst • TR-116 • TR-120 | ||