welcome~Shenzhen CITECH Technology Co., Ltd.
language selection：
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Soundproof solution：
? ≥20 dB, 80Hz to 100Hz；
? ≥25dB，100 to 200Hz；
? ≥35db，200 to 400Hz；
? ≥45db，400 to 1500Hz；
? ≥50dB, >1500 Hz
Sunny Lee
Mob(WeChat) : 13480658657
Skype：info_1127061
QQ:710061818,E-Mail：info@szcitech.com
Address: 29th, 6th Floor, Fanghua District 3, Fuyong Street, Baoan District of Shenzhen,China.