The switch has 2 positions: One for the high frequency ringer sound and the other for the lower frequency ringer sound. It has a light and switch to select between a high and low frequency ringer sound.
Telephone Ringer Phone Amplifier Wall Speaker Strobe Light Flasher Bell8809
Telephone Ringer Phone Amplifier Wall Speaker Strobe Light Flasher Bell8242
Telephone Ringer Phone Amplifier Wall Speaker Strobe Light Flasher Bell4373
2X(Telephone Ringer Phone Amplifier Wall Speaker Strobe Light Flasher Bell9739
CHAKAE External Loud Telephone Ringer Phone Rings Amplifier for Clearer Phone C
Flashing Loud Telephone Ringer Repeater Amplifier For Hearing Impaired
