Quickly find answers to the most frequently asked questions.


  1. Reduce the environmental impact when manufacturing products.
  2. Adhere to regulations and requirements related to environmental aspects to ensure the quality of the environment.
  3. Practice and hold recycling energy resources and educational training sessions, raising environmental awareness to cherish energy resources.
  4. Promise to continue improving environmental management and prevent pollution.
  5. Continue realization of educational training of the entire staff and management of operational safety.

DURABOOK® is the core brand of Twinhead International Corp., being deeply rooted in defense industry; DURABOOK was established to bring our technical excellence and un-paralleled quality harnessed by extreme military standards to customers across all industries.
DURABOOK serves a wide range of application fields including military, public safety, EMS, utilities, field service and transportation.
Our products range from rugged tablet PCs, rugged laptop, rugged panel PC/display to other customized boards and peripherals.
URABOOK will be sustain development, and always provide the best solutions for companies around the globe.

MIL-STD-810 is a series of performance and manufacturing guidelines set by the US Department of Defense for military and commercial equipment and applications.
These guidelines specify allowable parts and environmental condition ranges in which a device must be able to operate to meet the compliance.
The latest revision (as of 2012) is known as "MIL-STD-810G ".

MIL-STD-461 is a series of performance and manufacturing guidelines set by the US Department of Defense for military and commercial equipment and electromagnetic compatibility. The latest revision (as of 2013) is known as "MIL-STD-461F".
People at electromagnetic compatibility test labs typically set up their anechoic chamber to comply with MIL-STD-461, in order to support people who try to make the products they design comply to MIL-STD-461.
If a device complies with the MIL-STD-461, or is very close to MIL-STD-461, then it is certain to comply with the FCC Part 15 and EMC standards of other countries.

MIL-STD-1275 is a series of performance and manufacturing guidelines set by the US Department of Defense for military and commercial electrical systems in military vehicles. The latest revision (as of 2013) is known as "MIL-STD-1275E".
This standard covers the limits of transient voltage characteristics and steady state limits of the 28 volt (V) direct current (dc) electric power circuits of military vehicles.
The standard since 1967, is establishes minimum requirements for procedures, materials and systems for protecting electronic components in DoD systems and assemblies from adverse environments.
Protective measures shall be sufficient to maintain performance characteristics within specified limits both during and after exposure to moisture, high and low temperatures, corrosive gases, chemicals and microbial attack.
MIL-STD-3009 was developed by the US Department of Defense in February 2001, is a standard of establishes requirements for the emission characteristics of aircraft lighting, and display equipment that is intended for use with night vision imaging systems (NVIS).
It is applicable to all systems, subsystems, component equipment, and hardware that provide the lighting environment on aircraft where are NVIS.
An IP (Ingress Protection) number is used to specify the environmental protection of enclosures around electronic equipment.
These ratings are determined by specific tests.
The IP number is composed of two numbers, the first number is from 0 to 6, means to the protection against solid objects, and the second one is from 0 to 8, means to the protection against liquids. The number is higher, means more protection.
The standard is to be certified by CSA International or other IEEE/Governmental organization.
As different environments have different physical properties, it’s necessary to classify the three most hazardous environments: flammable gasses or vapors, and airborne fibers.
Class 1 - A quantity of flammable gas or vapor exist
Class 2 - The presence of combustible or electrically conductive dust exists such as (metal, coal and grain)
Class 3 - The presence of easily ignitable fibers air born but not in sufficient quantities to product ignitable mixtures.
But not all circumstances are contained within the classification, so break them down into the two basic divisions as follows:
Division 1 - A location where a classified hazard is likely to exist under normal operation
Division 2 - A location where a classified hazard does not exist under normal operation but may exist under abnormal conditions.
Night vision is the ability to see in low light conditions.
Whether by biological or technological means, night vision is made possible by a combination of two approaches: sufficient spectral range, and sufficient intensity range.
Night vision mode is standard with Sunlight Readable LCD; it can be displayed under direct sunlight.

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