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.
The Telephone Ringer Phone Amplifier Wall Speaker Strobe Light Flasher Bell3879 is ideal for individuals in need of a high-quality telephone amplifier that also doubles as a speaker, strobe light, flapper, and bell.
