The boya xlr to 3.5 mm trrs connector by-bca6 allows you to connect xlr microphones to your smartphone or tablet. the connector is compatible with ios devices (ipod, iphone and ipad), android devices, and other devices with the same type of headphone or microphone jack. the amplifier has a 3.5 mm headphone output, allowing you to listen to sound in real time. in addition, there is also a slider that allows you to adjust the volume: 0db / -10 db / -40 db. the adapter is powered by your smartphone and thus operates without batteries. Usage boya by-bca6 To use the adapter, connect the xlr input to the microphone. then attach the 3.5 mm cable to your smartphone or tablet. if you want to listen to sound live, plug the headphone cable into the 3.5 mm output. if desired, you can use the sound control to attenuate the sound.