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Frequently Answers and Questions
What does REN stand for?
Ringer Equivalence Number, which is the measure of how much power a device draws from the phone line.
Where can I find the REN of my RadioShack ET-153?
It is marked on the bottom of the device.
What should I do if I use multiple devices on the phone line and the total REN exceeds the limit?
Remove one or more devices from the line until the total REN is below the limit (five or three in rural areas).
What types of phone lines is the RadioShack ET-153 compatible with?
It is compatible with most phone lines, but not coin-operated systems, party-line systems, or most electronic key phone systems.
How do I set the dialing mode?
Use the TONE/PULSE switch on the side of the dialer. Set it to TONE for touch-tone service or PULSE for pulse service.
How do I turn the ringer off?
Set the RINGER switch to OFF.
How do I use the Hold feature?
Press the HOLD button to place the current call on hold. Press it again or pick up an extension phone to retrieve the call.
How do I use the Flash feature?
Press the FLASH button to send a timed electronic switchhook signal for services like Call Waiting.
How do I redial the last number?
Press the REDIAL button after pressing TALK/HANG UP.
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