An Official IR ball for RCJ Soccer Entry League. 
Requires 4x AAA batteries (not included)

Description from EK Japan's website: 

https://www.elekit.co.jp/en/product/RCJ-05R

・An official Robot Soccer Ball for RoboCupJunior competition and confirms with the modulated RoboCupJunior Soccer Ball standard.
・It also has non-modulated mode, the former RoboCupJunior soccer ball standard, and 2 other pulse modulation modes for other robot competitions (total of 4 modes).
・An LED with high visibility is adopted for the remaining battery level indication. It indicates the battery level by 3 lighting patterns.

* This infrared ball is approved by RoboCupJunior Technical Committee for RoboCup Junior Soccer Entry League 

Official Product of EK JAPAN
MADE IN CHINA