Kepo
Established in 1995, Ningbo KEPO Electronics Co., Ltd is a Sino-Korean Joint Venture with headquarters located in Ningbo China. They have four factories in Ningbo China and one in South Korea. The company covers an area of 16,000 square meters and have more than 1,000 employees. Their main products include Piezoelectric Ceramic, Piezoelectric Sensor, Buzzer, Speaker & Receiver, Alarm &. Horn and Microphone.
http://www.chinaacoustic.com/en_index.html