This is named WearPlay. It's a smart toy for Android Wear.

Like MoffBand , become the sound by shaking the arm, it is for AndroidWear app.

Can play while playing a sound effect from the smartphone app in response to gestures such as waving your arms. If you switch the sound effects, it can also play several ways, would enjoy from children to adults if this one.

The sound effects include the following types.

Sword, Japanese sword, Ninja star, boxing, magic wand

Following sound effects are also available by in-app billing.

Ninja star, robot, guitar, Dragon, Animal call, Wizard, Instruments

Future, I’m going to gradually increasing the types of sound effects.