This Ultratec Simplicity Doorbell Ring Signaler model LT is a wired doorbell signaler that will flash a lamp and transmit to receivers in the house to alert you that someone is at the door. This unit does require wiring.
There is also a combination Telephone/Doorbell Signaler which is a cost-effective way to signal both sounds.
L - Flashes plugged- in lamp.
T - Transmits to Remote Receiver.
D - Desktop model.
| Features | Model L | Model LT | Model LTD |
| Signals both the telephone ring and the doorbell. | |||
| Plugs directly into telephone line. | X | X | X |
| Built-in outlet to flash your plugged-in lamp. | X | X | X |
| Has switch to allow lamp to be turned on and off for normal room lighting. | X | X | |
| Transmits signal to remote receiver(s) to flash lamps in other rooms. | X | X | |
| Flash patterns follow the ring pattern. | X | X | X |
| Rests on a table or countertop. | X | ||
| Can plug in the Add-On Strobe in place of a lamp. | X | X |