Super-loud telephone ringer. 95+dB. Adjustable ring volume. Adjustable ring tone control 250Hz - 1,200Hz. Dual modular phone jacks for easy connection to a standard analog telephone. Make sure you never miss another call with Clarity's 95+ decibal, super-loud telephone ringer. It also features adjustable ring volume and ring-tone control from 250 Hz-1,200 Hz and dual modular phone jacks for easy connection to a standard analog telephone.