首页标题：弹力球 – 用弹跳球控制教室噪音！

首页关键词：

首页描述：A free classroom noise level meter, monitor and management tool. Perfect if your school kids are too noisy! Bouncing balls react to sounds from the microphone.

网站简介：

A free classroom noise level meter, monitor and management tool. Perfect if your school kids are too...