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
Telephone Ringer Phone Amplifier Wall Speaker Strobe Light Flasher Bell2451
Mobile Phone External Ringer - Mobile Phone Ringer Amplifier | 70dB Phone Amplifier, Ring Light, Phone Call Light Indicator, T Amplifier
External Ringer For Cell Phone 70dB Phone Amplifier Telephone Ringer masterly
