From Brotato Wiki
Item
Explosive Turret is an in-game item that can be bought from a Shop or can be found in a Crate. Most Items modify the Stats of the player, and some of them provide additional effects.
Buying the item spawns an Explosive Turret at the beginning of each wave that attacks enemies within 500 range for 25 + (175% ) damage every 0.87 seconds.
It is identical to the turret spawned by a Wrench Tier 4.
Scaling
Turrets are unaffected by Primary Stats, such as % Damage, Life Steal, Attack Speed, Crit Chance. But is affected by Engineering & Range.
Turrets are affected by Secondary Stats such as piercing and bouncing granted by the items Bandana & Ricochet. Not that turrets deal 100% even on bandana pierces, and ignores the -50% damage per pierce. Explosive Turret benefits from Explosion Damage and Size granted by Dynamite & Plastic Explosive. Turrets can inflict burning with Scared Sausage, and Snake helps Incendiary Turret inflict burn to more targets.