Telephone Ring Signalers Sonic Alert has three easy-to-use Telephone Ring Signalers. All three telephone signalers install simply by plugging into an electrical outlet and a modular telephone jack. When the phone rings, a light plugged into the signaler will flash to alert you. Only one telephone signaler is required in a home, even if you have many telephone jacks. With a Sonic Alert telephone signaler, you will never have to miss another phone call again! The Sonic Ring Elite, model TR 75 is our top-of-the-line telephone ring signaler. The sleek, modern case has a lamp on/off button to allow the lamp to be used for signaling and normal room lighting. The ingenious power cord with unique Pluglet (Plug-outlet) allows you to keep your table uncluttered by unsightly lamp cords. There is also an indicator light to remind you to turn on the attached lamp. In addition, its advanced design draws very little phone line power*. The Sonic Ring Elite sends a signal to all Sonic Alert remote receivers. The Sonic Ring, model TR 55 is best used in rooms that will use a separate lamp for normal room lighting as the lamp plugged into the TR 55 can only be used for signaling. The TR 55 sends a signal to all Sonic Alert remote receivers. If you need more than one light to flash, simply use remote receivers in other rooms. The Sonic Ring Jr. model TR 50 is similar to the TR 55 , but does not send a signal to remote receivers. This model is best used in studio apartments and dorm rooms that will only need one light for signaling. Click here for installation instructions