HP KD031AA#ABA Bluetooth Pendant Headphone (Discontinued by Manufacturer) Transmit wirelessly from any audio source with an audio-out port, such as an MP3 player, laptop, or CD player Get great sound from the high-quality earbud headphones, which can be removed and also used with other headphones Easily wear or carry: it's small and lightweight Use with your home stereo: transmit music wirelessly Charge via the AC adapter, or, while on the go, use any USB port to charge both the headphones and adapter