Make any handset an amplified handset. Installation is easy! Just plug the In-Line Amplifier into the jack on the phone for the handset, and plug the handset cord into the In-Line Amplifier. Works with almost any phone* and any type of handset Merlin, Carbon, Dynamic, Electret or Reversed Polarity. Easy to use slide volume control on top stays where you put it. Battery-Powered regular 9V battery (included) lasts about a year under normal use. *Before You Order: Some GE, RCA, and dial-in-handset
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