Compatible products: This is an easy-to-use earbud microphone compatible with BC-21 BC-21. It is hard to slip from your ears and does not slip easily, making it perfect for jobs that require a lot of movement such as hospitality or warehouse. ■ Cord Length: Microphone to Plug: Length: 29.5 inches (75 cm); Length from earphone to microphone: 11.4 inches (29 cm); The PPT button is large and sturdy for easy pushing; The clip is made of sturdy metal and rotates 360 degrees, so you can choose a comfortable position. Comes with a reliable manufacturer warranty. We will repair or replace your product at no cost for one month from your purchase. The **is 1 month from the date of purchase, so even if you do not use it immediately, please check the product once you receive it. Order number will be required for the **Please confirm your order number by checking your order history and email. This earphone microphone is for BC-21 only. Not for use with BC-20, BC-20chanty or other products.