About Us 》Contact US
A4 Factory Contact:
E-mail: info@a4tech.com.cn
Tel: +86 (769) 8209-7855
Dongguan, China
USA Contact:
E-mail: info@a4tech.com
Tel: +1 (909) 988-6633
Montclair, California
A4 Taiwan Office:
E-mail: info@a4tech.com.cn
Tel: +886-2-2218-4952
New Taipei, Taiwan