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About UsSend Inquiry Now Changzhou Esuntech Co.,Ltd. locates in Jiangsu near Shanghai which is convenient for goods transportation and customer visiting. And we have Electromax Co as the agent in Seoul Korea. 1.Since 1998: Specializing in acoustic components as below: Buzzer: piezoelectric (piezo) vibration element,piezoelectric buzzer,magnetic buzzer,SMD buzzer Speaker:piezo tweeter,Mylar Speaker,loundspeaker,tweeter speaker,TV Speaker,Car Speaker,multimedia speaker,woofer,subwoofer,Waterproof speaker etc Ultrasonic Sensor: for car parking system or distance measurer Antenna:rod antenna,indoor TV antenna,Satellite disc antenna LNBF Quality Certificate:ISO9001:2000 & QS9000:1998, ROHS compliant Factory size:5,000m2 Experienced engineer: 8 (including Korea engineer) Skillful & stable workers:more than 300 people, which we think very important for the reliable quality. Sales amount annually:3 million US dollars for worldwide market.