DPA offers you the opportunity to replace you old headset mic with a d:fine model and refunds you 75 € until April 30th.
If you purchase a new DPA d:fine headset microphone (including the brand new in-ear monitor/mic model) between March 17th and April 30th, send back your old non DPA model to you local distributor with the proof or purchase of you new DPA headset mic and fill out the form available at dpamicrophones.com/Trade-up-to-dfine_trade-up.html. DPA will pay you back 75 € or the equivalent amount in your local currency (excludes VAT).
You can submit the form and send back your old gear until May 10th. Modalities of participation are available at the form page.