Here's a problem almost every Plantronics wireless headset owner hits eventually: you need a replacement battery or ear cushion, you go looking for your model number — and there isn't one. Plantronics (now Poly) doesn't print the model on the headset. The only clue is a short code stamped on the bottom of the base, and one code often covers several different models.
This is the decoder. Find the code on your base below, and it'll tell you exactly which model you own — so you can order the right part the first time.
Quick answer
Last updated July 2026
Why you can't find your Plantronics headset model number
The model number isn't on the headset because Plantronics designed the wireless line around interchangeable bases — the same base hardware serves multiple headset models, so the identifying label lives on the base rather than the earpiece. That's efficient for manufacturing and maddening when you're trying to buy a part.
Myth
My headset model number is printed on the headset somewhere.Reality
It isn't. On Plantronics and Poly wireless headsets, the headset carries no model label at all — the only identifier is the base code on the bottom of the charging base. And because several models share one base, the code narrows you to a family; the wearing style (over-the-head, over-the-ear, convertible) tells you which one within it.Plantronics / Poly wireless base code decoder
Flip your base over, read the code on the bottom, and find it here. Where a single code lists several models, they share the same base — confirm the exact one by the headset's wearing style, or call and we'll pin it down.
| Code on the base | Model(s) it identifies | Series |
|---|---|---|
| CO54 / C054 | CS540 | CS500 |
| CO54-XD / C054-XD | CS540-XD, CS545-XD | CS500 (Extra Density) |
| CO53 / C053 | CS530 | CS500 |
| CO52 / C052 | CS510, CS520 | CS500 |
| WO2 / W02 | Savi W710, W720, W730, W740, W745 | Savi 700 |
| W8200B | Savi 8210, 8220, 8240, 8245 | Savi 8200 |
| WO1 / W01 | WO100, WO200, WO300, WO350 | Savi Office (legacy) |
| CS70 NC | CS70N | CS70 (legacy) |
The O-versus-zero catch: The base codes mix the letter "O" and the number "0" in a way that's genuinely hard to read — "CO54" and "C054" are the same code for the same CS540. When matching your base, treat the O and the 0 as interchangeable; it's the digits and the pattern that matter.
How to find the label on your base
The code is on the underside of the charging base, not the headset and not the base's front face. Lift the headset out of its cradle, turn the base over, and look for a small printed or molded code among the regulatory text and serial number — it's the short one that matches a pattern in the table above. If your base has been replaced at some point, trust the base code over any assumption about what you originally bought, since the base is what determines compatibility.
Found your model? Here's how to get the right part
Once the base code has told you your model, you can order the matching part with confidence. The most common request is a battery — a wireless headset that no longer holds a charge is almost always a worn battery, not a dead headset.
- CS540 owners: the CS540 (CO54) replacement battery restores full runtime.
- Other models: browse wireless headset parts or Plantronics parts and accessories for batteries, cushions, and base components by model.
- Not sure which part: call 877-999-3838 with your base code and we'll match the exact part.
If your headset is beeping rather than dead, that may be a different issue — our guide to what your headset's beeps mean decodes those. And if you've identified a CS540 and want to understand its variants, our CS540 vs CS540-XD vs CS545-XD comparison explains the differences behind those XD base codes.
Where is the model number on a Plantronics wireless headset?
There is no model number on the headset itself. Plantronics and Poly wireless headsets are identified by a code on the bottom of the charging base — for example, "CO54" for a CS540. Turn the base over and match the code to identify your model, since the same base is shared across several headsets.
What model is a Plantronics base labeled CO54 or C054?
A base labeled CO54 or C054 is a Plantronics CS540. The two spellings are the same code — the label mixes a letter O and a zero ambiguously. The CS540 is a convertible DECT wireless headset, and its replacement battery and parts are ordered under the CS540 or C054 designation.
What does a WO2 base code mean?
A base labeled WO2 (or W02) belongs to the Plantronics Savi 700 series, which includes the W710, W720, W730, W740, and W745. Because all five share the same base, the wearing style of your headset determines exactly which model you have. Parts for these are ordered under the Savi 700 series.
Why do several Plantronics models share the same base code?
Plantronics built its wireless line around interchangeable bases, so one base serves multiple headset models that differ mainly in wearing style. That's why a code like W8200B covers the Savi 8210, 8220, 8240, and 8245. The shared base means the code narrows you to a family, and the headset style identifies the specific model.
How do I find the right battery for my Plantronics wireless headset?
First identify your model using the base code, then order the battery listed for that model. For a CS540 (CO54 base), that's the CS540 replacement battery; for other models, the wireless headset parts collection lists batteries by model. If a headset that once lasted a full shift now dies quickly, a replacement battery restores it rather than requiring a new headset.
The trick with any Plantronics or Poly wireless headset is to stop looking at the headset and flip the base over. That one code tells you everything you need to order the right part — and if the letters and numbers blur together, our team will read it with you over the phone. Start with the wireless headset parts collection once you've matched your model.
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