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Just place your smartphone; Easy and eco-friendly ceramic speaker that does not require power supply. Just place your smartphone and it will make sound like a speaker. Easy to place and change to an eco-friendly ceramic speaker. Insert it into the top mouth for increased volume. The smartphone ceramic speaker dedicated for smartphones, has been made to the best size by calculating the size (aperture) of the speaker unit that determines the sound quality of the speaker, and the size (volume) of the housing.