Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Does it come with a 2.5mm jack ?
Document: Keep in mind that YOU MUST USE QUICKCONNECT ADAPTERS WITH THIS HEADSET. With the QuickConnect adapters (A10, 3.5mm, and 2.5mm) I can use this headset with every phone that I use to do my job. The adapters allow me to move between phones with different sized headphone jacks very quickly. I am hoping this will be my last headset for a while.
I purchased the HW251N and the A10 connector to use with my CISCO IP Phone 7945 and it doesn't work. I can hear sound only when I plug the headset into the phone receiver jack (not the headset jack which is right next to the receiver jack on the bottom of the phone) and the microphone does not work at all. I'm really bummed because I thought that this product would work based on the reviews that I read.
Really?!?!? It would have been nice if it was clearly stated that it didn't come with the handset connector. How are we supposed to use it. Now I have to buy the adapter.
That said, the SupraPlus doesn't look bad at all, just plain Jane compared to the EncorePro.Notes:- You can get LEATHERETTE EARMUFFS SEPARATELY FOR THE SupraPlus (HW251N/HW261N). These are NOT as high quality as those that come with the EncorePro, but folks who tried them out for me marginally prefer them over the foam.
Review for:  Plantronics SupraPlus Telephone Headset (HW261N binaural and HW251N monaural)OVERVIEW:-----------Here below we compare and discuss the 2 highest-end (sound quality especially) Plantronics wired headsets with noise reduction, SupraPlus vs. EncorePro.
We have Cisco SPA525G phones with headset jacks. We purchased the &#34;Plantronics 18straight Cable - Quick Disconnect To 2.5 Mm Plug&#34; and then attached this headset to it. Worked great. Sound quality is good and microphone doesn't pickup a bunch of background noise. Only comment is that the cord from headset to disconnect is only 24 inches, so even with the 18&#34; cable isn't long enough for a few of our users. consider distance.
Most users trying both told me the EncorePro earmuffs were marginally more comfortable at the start.The EncorePro is a 10% LIGHTER headset (2.5 vs. 2.8 ounces). It has more aluminum and superlight nylon in the build compared to the SupraPlus.Though initially everyone found the EncorePro SLIGHTLY MORE COMFORTABLE than the SupraPlus, as time passed some folks said the EncorePro felt too WOBBLY/INSECURE on the head and switched to SupraPlus.
If you are in a quiet environment you may sound clearer with a headset with a voice tube. However, in all likelihood this is not an issue for someone paying extra to get a headset with noise reduction. (2) NO OPTION TO TAKE CALLWITHOUT PICKING UP HANDSETPlantronics support confirmed this. If you found a solution for this, like perhaps found a phone that allows this, please describe in comments.HOW TO GET MORE NOISE REDUCTION!
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When I called the Company I bought it from said was recommended that I buy a $120 amp to have it work better...no thank you!
Answer: It does not. We had to purchase the DA40 USB Digital Adapter to work with our VVX-500 phones. Part # 71800-41