Hong Kong based company with factory in China, Guangdong Province. Our business from product design, toolings to manufacturing and export. OEM are also welcome.Soan Lock Features :Fully Mechanical, No electrictiy needed;Key or keyless is available depends on customers' using habit;Using aviation mechanical control technique;Code combination upto 665,000 times which is much beyond than existing market of less than 3000 times code combination;Anti-peeking function : the code won't disclose to others even there is people stare at you when you are pressing the code to unlock the door;Patented;Nation Certificate obtained;Easy installation and code change;please visit website of soan.hk for details;please contact us directly via our email in our website soan.hk shown.