Green Call

The Green Calls (グリーンコール, Gurīnkōru) are small hand-held devices. They were given to two children, and whenever there is a kaiju terrorizing the rest of the kids they signal Greenman to Earth.

Appearance
The Green Call has is circular and it's outer shell is a silver color. The inside/front of it is red with a black dot in the center. There are 6 circular lights placed on it too. Those light up during the process of calling Greenman

Go! Greenman
The Green Call was first seen in Go! Greenman Episode 1: Greenman vs. Garameddon. In the series it was used to signal Greenman.

Trivia

 * The Green Call makes an appearance in the Go! Greenman opening
 * It has made an appearance in every episode of Go! Greenman