Sennheiser MX W1 In-Ear Totally Wireless Headphone with Digital High-Fidelity Stereo Sound (Discontinued by Manufacturer) Compatible with all MP3, DVD, CD players and iPod Carrying case with quick-charge functionality enables up to three full recharges to receivers while on the move No setup required, simply plug the transmitter to your personal audio/video player, put on the earphones and turn it on True lossless, digital wireless high-fidelity stereo sound Twist-to-fit system for a secure, stable fit without compromising bass or comfort True lossless, digital wireless high-fidelity stereo sound No setup required, simply plug the transmitter to your personal audio/video player, put on the earphones and turn it on Twist-to-fit system for a secure, stable fit without compromising bass or comfort Carrying case with quick-charge functionality enables up to three full recharges to receivers while on the move Compatible with all MP3, DVD, CD players and iPod