BEM NKD 50 Wireless Earbuds offer superior sound while remaining sleek and compact. Running on Bluetooth 4.1, you can expect high quality sound while listening to your favorite music or talking to somebody on the phone with hands-free calling. With the NKD 50 you can even connect two bluetooth devices at the same time!NKD Bluetooth Stereo Earbuds give you complete wireless freedom, eliminating cables of any sort by the use of advanced Bluetooth 4.1 technology. They last up to 4 hours on a single charge. NKD Earbuds have a speaker phone function and come with a carrying case.