From Brotato Wiki
Explosive 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 an Explosive Turret at the beginning of each wave that attacks enemies within 500 range for 25 + (175% ) damage, attacking every 0.87 seconds.
It is identical to the turret spawned by a Wrench Tier 4.
Turrets are unaffected by Primary Stats, such as Damage, Life Steal, Attack Speed, Crit Chance. But is affected by Engineering.
Turrets are affected by Secondary Stats such as piercing and bouncing granted by the items Bandana & Ricochet. Explosive Turret benefits from Explosion Damage and Size granted by Ricochet & Plastic Explosive. Turrets can inflict burning with Scared Sausage, and Snake helps Incendiary Turret inflict burn to more targets.