Fine Arts and Art Installation Design The Voice of Ceramic Resonant Speaker by Hangzhou Keydo Industrial Design Co.,Ltd The Voice of Ceramic is a series of resonant speakers made of ceramic for mobile phones. There is a long history of the use of china(ceramic) as a material for making musical instruments. It naturally amplifies volume without a power supply, and obviously reduces carbon emissions. The designs embody a union of ancient ceramics and high-tech mobile phones, a combination of traditional crafts and modern industrial design concepts. The sound from mobile phones will be amplified and it can be increased by 12dB through this speaker due to the effects of sound convergence and resonance.