This microphone attenuator cable allows you to not only monitor your audio but also record from a single 3. 5mm output jack. Connect a recorder, microphone, mixer, and more to a Dslr camera or camcorder and start recording. It features a -25dB signal attenuation, perfect for microphone preamps and Dslr cameras that require it. The Mv-RC300 allows you to monitor audio very easily, especially for the Sony a6300 which does not come with a headphone jack. Designed with the proper impedances for low noise operation and shielded gold-plated connectors prevent additional noise. Specifications Connector#1: One 3. 5mm Male Line Jack Connector#2: One 3. 5mm Male Mic Jack Connector#3: One 3. 5mm Female Input for Headphone Monitoring Total Length: 12 (30cm)