Jungle Drums (BTD3-BTD5)

Jungle Drums is the 2nd upgrade for the Monkey Beacon in BTD4 and the second upgrade of path 1 for the Monkey Village in BTD5. In BTD4, Jungle Drums cost $1275 on Easy, $1500 on Medium, and $1600 on hard. In BTD5 it also costs $1275 on Easy, $1500 on Medium, $1620 on Hard and $1800 on Impoppable. It increases attack speed of all towers in its radius by 17.6% (15% faster attack cooldown). Towers that attack every four frames or faster, like Spectre, Sun God, and Ray of Doom are unaffected (BTD5 Flash only).

Differences Between BTD5 Flash and BTD5 Mobile
Jungle Drums can increase the attack speed of the Super Monkey.

Update History (Bloons TD Battles Mobile)
Jungle Drums price decreased ($1500 → $1300).
 * 4.3.1

Trivia

 * It's a good idea to combine this with extremely powerful towers such as the Destroyer, Spiked Mines, or Bloon Impact.
 * In Bloons TD5 Mobile, upgrading Attack Speed to Level 8 in the Monkey Lab will allow all towers to "be under the effect of Jungle Drums". This can stack with this tower upgrade, making it very efficient (and even more efficient with a Specialty Building upgraded to Tier 2, if it increases attack speed).