Premium quality conversion. The Rode HJA-4 provides you with four 3.5mm to 1/4-inch industry-standard headphone adaptors. These are an excellent choice for converting any headphones (which offer a 3.5mm input jack) so that they can be used with interfaces and equipment that offer bigger 1/4″ headphone inputs. Although the HJA-4 can be used with any device which offers 1/4″ headphone inputs they are particularly suitable if you desire to connect your headphones to the RODECaster Pro. Please Note:The RODECaster is not included in this package.