Description: Having Vibrating Alert Function, you won't miss any important calls. With functional clip, easy to wear, mount your headphone conveniently on your shirt Extra long work time, up to 8 hours of talk / play time, and 180 hours of standby time. Retractable cable technology, after finishing your call, retract your cable with asingle push of a button. Pair two phones simultaneously, enjoy the comfort of pairing two phones at the same time with this bluetooth headphone. Function: bluetooth, microphone, voice control, answering phone, song switching, multi connection function. Specification: Wearing type: In-Ear Connectivity: wireless Connecting interface: Micro USB Talk time: 5 hours Music Time: 4 hours Standby Time: 80 hours Bluetooth version: V4.0 Resistance: 32Ω Sensitivity: 120±5dB Frequency Response Range: 20-25000Hz Package Includes: 1 piece of BT earphone 1 user manual 1 USB charging cable Note: Please contact us firstly if there are any problems with the product. The item's color may be slightly different from the pictures due to the light and screen setting difference. Please allow slight dimension error due to manual measurement.Thanks for your kindly understanding.