Radio Shack ET-543 owner manual Read this Before Installation, FCC Statement

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43-1043.fm Page 4 Tuesday, August 17, 1999 10:36 AM

READ THIS BEFORE INSTALLATION

We have designed your telephone to conform to federal regulations, and you can connect it to most telephone lines. However, each device that you connect to the phone line draws power from the phone line. We refer to this power draw as the device’s ringer equivalence number, or REN. The REN is shown on the bottom of your phone’s base.

If you are using more than one phone or other device on the line, add up all the RENs. If the total is more than five, your phone might not ring. In rural ar- eas, a total REN of three might impair ringer operation. If ringer operation is impaired, remove a device from the line.

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FCC STATEMENT

This telephone complies with Part 68 of FCC Rules. You must, upon re- quest, provide the FCC registration number and the REN to your phone company. These numbers are located on the bottom of your phone’s base.

Note: You must not connect your phone to any of the following:

•Coin-operated systems

•Party-line systems

•Most electronic key phone sys- tems

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Contents ET-543 Features Fm Page 3 Tuesday, August 17, 1999 1036 AM Read this Before Installation FCC StatementContents Installing the Phone InstallationSelecting a Location Charging Battery Connecting BatteryPreparation Setting the Dialing Mode Using the Handset At the Base Using the Handset Away from the BaseOperation MAKING/ANSWERING a CallUsing FLASH/DEL Using RedialReducing Interference Using Memory DialingStoring a Number in Memory Dialing a Stored Number Entering a Pause A Memory NumberTesting Stored Emergency Numbers Chain DialingTroubleshooting SolutionsProblem The handset’s range decreases Care and Maintenance Replacing Battery FCC Wants YOU to KnowLightning RadioShack Division of Tandy Corporation Fort Worth, Texas

ET-543 specifications

The Radio Shack ET-543 is a noteworthy addition to the realm of portable electronic technology, particularly in the category of handheld calculators and educational tools. Launched during a vibrant era of innovation, the ET-543 encapsulates the spirit of the late 20th century, when personal computing and digital gadgets became increasingly accessible to the general public.

At its core, the ET-543 features a natural display that allows for easy viewing of calculations, making it user-friendly for both novices and seasoned users alike. The device is equipped with a combination of mathematical functions that streamline computations ranging from basic arithmetic to more complex algebraic operations. This wide array of capabilities makes the ET-543 an ideal choice for students and professionals who require a reliable tool for everyday calculations.

One of the standout technologies of the ET-543 is its robust memory function, which allows users to store multiple calculations for later use. This feature is particularly beneficial for users who engage in repetitive tasks or require a quick reference for previously calculated values. Coupled with its programmable functions, the ET-543 presents a versatile platform that can accommodate a range of mathematical needs.

In terms of design, the Radio Shack ET-543 boasts a compact and lightweight form factor, making it highly portable. This characteristic is essential for users who need a dependable calculator on the go, whether in the classroom, workplace, or during travel. The button layout is intuitive, allowing for easy navigation through various functions without the need for extensive training.

Another important aspect of the ET-543 is its educational value. The device serves as a practical teaching aid, helping students grasp fundamental concepts of mathematics and computation. Its durability and ease of use ensure that it stands up to repeated use in educational environments.

In summary, the Radio Shack ET-543 is more than just a calculator; it embodies the fusion of technological innovation and user-centric design. With features tailored to meet a variety of mathematical challenges, coupled with its portability and educational utility, the ET-543 remains a symbol of practical technology that resonates with users across generations.
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