A membrane keyboard is a computer keyboard whose "keys" are not separate, moving parts, as with the majority of other keyboards, but rather are pressure pads that have only outlines and symbols printed on a flat, flexible surface. Very little, if any, tactile feedback is felt when using such a keyboard, and error-free blind typing can be difficult. Membrane keyboards, which work by electrical contact between the keyboard surface and the underlying circuits when key top areas are pressed, were used with some early 1980s home computers, and have been much used in consumer electronics devices. The keyboards are very inexpensive to mass produce, and are more resistant against dirt and liquids than most other keyboards

Dome-switch keyboards are kind of a hybrid of membrane and mechanical keyboards. They bring two circuit board traces together under a rubber "dome" or bubble. The inside of the top of the bubble is coated in graphite. When a key is pressed, it collapses the dome, which connects the two circuit traces and completes the connection to enter the character.

On a scissor-switch keyboard, the keys are attached to the keyboard via two plastic pieces that interlock in a "scissor"-like fashion, and snap to the keyboard and the key. Scissor-switch technology does not use a rubber-plunger assembly like most other keyboards. Scissor-switch keyboards are normally responsive and crisp. These keyboards are generally quiet. The keys require little force to press. This keyboard technology is mainly used in laptops.

Mechanical-switch keyboards use real switches, one under each key. Depending on the construction of the switch, these keyboards have varying responses and travel times. Notable keyboards utilizing this technology are the Apple Extended II, and its modern imitator, the Matias Tactile Pro. These two keyboards use ALPS switches. Cherry Corporation of Germany also makes mechanical switches used in special purpose and high-end keyboards. In India, the TVS Gold mechanical keyboard is very popular despite costing about five times a membrane keyboard.

Some keyboards are designed out of flexible materials that can roll up in a moderately tight bundle. Normally the external materials are either silicone or polyurethane. It is important to note that although many manufacturers claim that the keyboards are foldable, they cannot be folded without damaging the membrane that holds the circuitry. Typically they are completely sealed in rubber, making them watertight like membrane keyboards. Like membrane keyboards, they are reported to be very hard to get used to, as there is little tactile feedback.

An ergonomic keyboard is a computer keyboard designed with ergonomic considerations to minimize muscle strain and a host of related problems[1]. Some ergonomic keyboards are a single board, with the keys separated into two or three groups, allowing the user to type at a different angle than the typical straight keyboard. Some ergonomic keyboards have the keyboard split into several independent pieces. Either of these types of keyboards may include elevated sections at various angles. Other ergonomic keyboards have fixed, vertically aligned keys, so the user types with his or her hands perpendicular to the ground, thumbs-up. Still others allow a range of rotation and elevations.

A wireless keyboard often includes a required combination transmitter and receiver unit that attaches to the computer's keyboard port (see Connection types above). The wireless aspect is achieved either by radio frequency (RF) or by infrared (IR) signals sent and received from both the keyboard and the unit attached to the computer. A wireless keyboard may use an industry standard RF, called Bluetooth. With Bluetooth, the transceiver may be built into the computer.

Most likely, yes. DSI products have been tested across a wide range of PLCs, blade PCs, tablets, terminals, scanners, desktop computers, laptops and many other proprietary systems. We are constantly testing compatibility with new device as they hit the market, and are also always capable of catering DSI products to suit your application.

All Fully assembled DSI products are covered by a ONE YEAR limited warranty. All OEM DSI products are covered by a 90 days limited warranty. Both warranties cover repairs other than those caused by extensive abuse or misuse.

The battery life will depend on the time you use every day, Normally the battery can be used almost 2-3 months in two alkaline AA type batteries.

That is ID code loss problem; you just follow the ID setting procedure to setup again.