Connect the power to the transmitter. Basically, if this pair is an upgrade for you, itll expose alot of detail in your sounds that you play through it, so any poorly encoded stuff will show immediately (and bad mastering too, like over-compression, sub 20kHz roll-offs, clipping, etc. Excelentes audífonos, los adquirí para llevar mejor las conferencias y llamadas de mi trabajo, el audio y micrófono son una maravilla. I?m not huge I normally wear about a size 6. My head is pretty small and the sizing velcro isnt quite sufficient to make it a perfect fit but Im still satisfied. They were very comfortable. I saw other reviews and thought I?d try them but it ended up being a waste of money bc I removed them and won?t use them again unless I?m desperate. Aber das mag jeder selbst entscheiden. They are thin and flimsy, and I even purchased a spare strap kit since I expect the straps to fail prematurely. Im only 6,2 220 pounds.