What Is an Access Denial?

Access denial is a security tool used to limit access by persons who may be unauthorized. It uses an automated algorithm to determine if a user has permission to access … Read More

What Is a Receiver Amplifier?

A receiver amplifier is a home theater component that performs the two basic functions of switching between different inputs, and amplifying audio signals before they are routed to loudspeakers. Receivers … Read More

What Is a FET Transistor?

A field-effect transistor (FET) is a three-terminal device that can control the amount of electricity allowed to pass through. FET transistors are able to switch or control electricity very rapidly. … Read More

What is a Bluetooth Earphone?

A Bluetooth earphone is a wireless earpiece that can be connected to a mobile phone, an mp3 player, a laptop or other Bluetooth-enabled device for hands-free use. Bluetooth earphones operate … Read More

What are Rock Speakers?

Rock speakers are speakers with a facade designed to look like rocks, but which actually deliver audio, usually in an outdoor setting. While the speakers may cost a little more … Read More

What is an Underwater Digital Camera?

An underwater digital camera is a digital camera which is designed to function underwater. It may take still or video photography or both, depending on the model. Such cameras tend … Read More

What is a Weatherproof Phone?

A weatherproof phone is a type of phone that has been designed to withstand environmental elements. Generally, it is sturdier and more functional than the average phone. The most common … Read More

What is HD Radio?

HD radio is a brand name, and it should not be confused with HDTV. It doesn’t refer to either high-definition radio or satellite radio. This type of radio broadcasting allows … Read More

What Is Online Voicemail?

Online voicemail records and stores phone messages on the Internet. Customers can set it up to work in a number of ways, possibly receiving free access with some products. This … Read More