Bluetooth4.1 stereo wireless headphones headset/Earbuds OLED screen display with Mic &hellip; 1OLED display, easy to master the headset state, such as the volume, battery level and caller number. 2Bluetooth 4.1It allows to connect to two mobile phones at the same time, bring top speed & power saving & enhanced transmission, superbly compatible with iOS, Android and Microsoft, a perfect match for 4G, standby time up to 100hrs. 3Connection with stereo set and your bluetooth device: OLED display could be connected to stereo set with an audio cable, and remote controlled via bluetooth by your cellphone or other device. 4 Advanced DSP noise reduction, reduce the noise around you, bring you crystal-clear calls.(non active noise cancelling) 5Built-in Mic can be used for clear phone calls, never miss a call when enjoying music you love. Voice prompt in 4 languages, English/Chinese/French/Spanish.