The core difference
A 1-way remote sends commands to the car. A 2-way remote also receives a reply, and shows it with lights, an LED pattern, an LCD or a color LCD.
That reply is the product. It tells you the engine started, the doors locked and the alarm armed.
When 1-way is plenty
If you can see the car when you press the button, such as from a driveway window or a short walk, a 1-way remote does the job. It is lighter, simpler and usually costs less.
One-button remotes, such as the ones in the 4115V and 4119V, are the simplest form.
When 2-way earns its keep
If the car is out of sight, in a parking garage or across a big lot, you want to know the command worked. A 2-way remote also tends to have more range than a 1-way remote of the same family.
If you want to see the cabin state at a glance, the color LCD remote on the 5908V is the most informative option in the lineup.
A middle road
Some systems, such as the 5308V and 5908V, include both a 2-way remote and a simple 1-way remote. Use the 2-way for distance and the 1-way as a spare or a second driver’s remote.
A quick way to decide
Ask one question: "If I press the button and nothing seems to happen, what do I do?" With a 1-way remote you press again or walk to the window. With a 2-way remote the screen tells you. If that question never comes up in your day, save the money.
Quick answers
Do 2-way remotes use more battery?
They can. Some are rechargeable. Ask about the model you choose.
Can I upgrade a 1-way system to 2-way?
It depends on the receiver in the car. Call with the system model.
