To help the hearing-impaired to recognize ring. Flasher Color: Red.
5X RJ11 Adapter Louder Telephone Flash Amplifier Ringer for Landline7721
RJ11 Adapter Louder Telephone Flash Amplifier Ringer for Landline5190
2X(RJ11 Adapter Louder Telephone Flash Amplifier Ringer for Landline5178
RJ11 Adapter Louder Telephone Flash Amplifier Ringer for Landline2819
3X RJ11 Adapter Louder Telephone Flash Amplifier Ringer for Landline3265
1X(RJ11 Adapter Louder Telephone Flash Amplifier Ringer for Landline6220
