From Brotato Wiki
Laser Turret is an in-game item that can be bought from Shop or can be found in a Crate. Most Items increase the Stats of the player while some of them provide unique effects.
Buying the item spawns a Laser Turret at the beginning of each wave that attacks enemies within 400 range for 20 + (150% ) damage, attacking every 0.87 seconds. The Laser pierces up to 3 times.
It is identical to the turret spawned by a Wrench Tier 3.
Turrets being Structures are unaffected by Primary Stats, such as Damage, Life Steal, Attack Speed, Crit Chance. But are affected by Engineering.
Turrets are affected by Secondary Stats such as piercing and bouncing granted by the items Bandana & Ricochet. Turrets can inflict burning with Scared Sausage, and Snake helps inflict burn to more targets.