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The Series 6 provides a full set of advanced features in a craft-grade design. All Series 6 models include our SIGNALSHIELD™ circuit for the protection of digital/data circuits so you can test POTS service on DSL circuits without harming the data or being "locked out".
HD-610 Same full feature set as the HD-630 but without the SIGNALALERT™ circuit or speakerphone. The HD-610 includes a battery powered speaker for amplified listening in talk and monitor modes.
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