MONODEAL 606345491642 wireless stereo headphones let you listen to music or audio from your TV, DVD player, CD player, MP3 player, or other audio source, both indoors and outdoors. The headphones feature automatic tuning, a phase lock loop (PLL) transmission system, and automatic battery recharging. They also have a built-in volume control and a rechargeable receiver. The transmitter has a built-in charger and can be connected to audio devices with a 3.5mm audio plug or RCA socket audio adapter.