BTD Science 101 - of all towers in the game, only the mortar with bloon buster upgrade can strip more than 1 layer of bloon at a time.
~ BTD4 after Round 56
Bloon Buster is the 3rd upgrade in BTD4 and the 3rd upgrade in path 1 in BTD5. It pops 2 layers of Bloons. It is powerful against a group of Bloons. The Mortar Tower's color changes from green to white (red in BTD4). Groups of Bloon Buster Mortar Towers can really thin massive amounts of Bloons. As stated in the Bloons TD 4Pre-Round Comment, this upgrade is the only tower that can strip more than one layer at a time in Bloons TD 4.
When players use it in reality, players must wear 2 layers of long-sleeve shirts, long pants, covered shoes, thick gloves and any type of headwear to protect it from any deep explosions or the player can wear a HAZMAT Suit if they want to look like that tower's appearance.