Crystal Clear Calls: Utilizes a 360-degree fully open microphone, ensuring clear and crisp call qualityHiFi Sound Quality: Employs a composite diaphragm dynamic driver for perfect rendering of high, mid, and low frequenciesPain-Free Extended Wear: Designed with ergonomics in mind, providing a pain-free wearing experience even during prolonged usePlug and Play: Ready for use as soon as it's plugged in, offering convenience and practicalityEasy Storage: Comes with a crystal box for convenient and easy storage of the earphonesSpecification: Model: EM039Bluetooth version: V5.2Transmission distance: 10MBattery capacity: 3.7V/400mAhRunning time: 24HHorn parameters: 32Ω±10Transmission frequency: 2.4GHz-2.48GHzFrequency response range: 100Hz to 20KHzInput port: Type-CFunction: Listen to music, call, AUX playMaterial: ABSSize: 168*184*76mmExecutive standard: GB8898-2011 Package included: 1 x Earphone 1 x Charging Cable 1 x English and Chinese User Manual Other items not include