Yealink T21 E2Two lines, no PoE required.

Why the T21 E2 is on the catalog.

The T21 E2 is the unglamorous version of the volume-seller T21P E2: same two lines, same screen, same Opus codec, same Yealink provisioning, no PoE chip. You buy it when the deployment is small enough that running PoE switches across the building does not pencil out, and the existing wall outlets are right there under each desk anyway.

Where it makes financial sense: residential VoIP installations, small retail counters, two-room satellite offices, anywhere the total phone count is under five and the building is already wired with adapters in mind. Skip it if the office has any modern managed PoE switch — at that point the T21P E2 is worth the extra $10 to clean up the cable mess and free a wall outlet at every desk.

What it is not good for: scaling up. The moment you have a tenth desk to add and want to standardize across the fleet, you wish you had bought T21P E2s from the start because the adapters become their own inventory problem. For a one-off home office line, this is the phone. For an office that might grow, spend the $10 and get PoE.