Battery display allows you to know the headphone battery level at any timeWith vibration reminder function, you will not miss any important callsEasy-to-wear clip with functional clip for conveniently attaching Fineblue to your shirtSuper long talk/play time, talk/play time up to 20 hours, standby time 180 hoursPair two phones at the same time and enjoy the comfort of Fineblue pairing two phones at the same time.Patented retractable cable technology allows you to retract the cable at the touch of a button after a call(Built-in cable)Works with any BT enabled phoneModel: K55Wearing type: In-earFunctions: Bluetooth 5.2, microphone, voice control, answering calls, song switching, multi-connection functionConnectivity: WirelessConnection interface: Micro-USBApplications: mobile phones, computers, portable media playersTalk time: 20 hoursMusic time: 20 hoursStandby time: 180 hours (180 days without power)Bluetooth: YesBT version: V5.2BT mode: hands-free, earphonesMaterial: PVCcolour: BlackPackage Contents: 1 x Data cable1 x Lavalier Bluetooth headsetOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.