The Cheng Juan Technology Co., Ltd. is continually improving the product process & structure, and obtaining the competition & high quality . Our products are more & more easy to install, use, design & hi-performance. In these years, we specialize to develop Hi-power speakers, Siren speakers & Explosion-Proof speakers of for the professional power amplifier & alarm systems. We believe all our staff will always offer the profession product and service in the future.