ECHO SPIN - users can simply recharge it by the following steps; press the button and spin the circular line.

The battery has two types; metal and black crack. when the metal battery comes into use, the ui is changed into echo mode.
on the other hand. it users put battery of black crack type, the ui become busiess one. due to this changing ui,fuction. they are able to use it with personal favors.

Jungwoo Choi
industrial design Seoul, South Korea