Be aware that there is no returns and refunds for this product. I bought the size "recommended" by the product page, but should have gone larger. 5 to 8 US. Very easy plug & play. Would not recommend if youre looking for something longer lasting. Overall they?re super cute though and I?m happy with them! " Then there are the extensions. For this like podcasts or audibooks which Ill be using mostly theyre perfect. Great shape, great size, but difficult to get the product out! Love this to wear with tee shirt and sweater dresses.