SameTop Bluetooth 4.1+EDR Stereo Headphones Portable Wireless Sports Headset Earphone OLED Display With Mic For IOS/Android/Windows System Black Can used for bluetooth receiver,let your wire speakers change into wireless speakers. DSP Noise cancelling.can connect to 2 moble phone Bluetooth 4.1 sport headsets,compatible with the IOS/Android/Windows system and perfect match for 4G OLED display,Has the battery power display and phone number incoming display function Wired become wireless,ordinary speaker can also become bluetooth speaker,so cool