1. ISO9001:2000 approved. 2. Specialized in car siren, motorcycle siren as well as electronic siren. 3. Introducing advanced full-automatic double-crest welding system, plastic machine and automatic assembly line both at home and abroad. 4. Car siren series: one tone, six tone, eight tone tuning siren, back up battery, voice siren......... 5. Production Power: 600000pcs per month.