| 摘要 |
The present invention relates to a nonelectric speaker exclusively for a smart phone using a sound howling phenomenon. The prevent invention is to prevent the existing speaker using electricity from excessively consuming the battery of a smart phone and providing electromagnetic wave influences by using a sound howling phenomenon without using electricity. The present invention eliminates the problems of the existing electric speaker, is conveniently carried, and is made of a variety of materials and in a variety of designs. |
