Product Name: Bluetooth Earphone 5.0 Wireless 8d HiFi Sport Headphone Mic Earbuds Gaming Music Headset Model NO.: ASHVTB9 Distance version: Class A Specifications: HSP Color: White Black Red Characteristics: Power Display Function: Bluetooth, Multimedia Soundtrack: Dual Track Bluetooth Version: 4.0 Usage: Mobile Phone, Call Center, MP3 & MP4, Computer, Game Player Style: In-ear Trademark: OEM Transport Package: Retail Package Origin: China Product Description Product NameB9-TWSBluetooth versionsecond generation Bluetooth 5.0Music / call duration3 hoursCharging box can charge the headset4-5 timesCharging box capacity300mAh polymer lithium batteryHeadphone single ear capacity50mAh polymer lithium batterySensitivity120dBImpedance32ΩBluetooth transmission distance10 metersCharging voltage3.7VBluetooth decoderACC