Product Name: 3D Stereo Bluetooth Earphones Automatic Pairing Mini Tws Wireless Earbuds (with Built-in Cable charging Case) Model NO.: GT2 Distance version: Class A Specifications: HSP Color: Black Characteristics: Support Music Function: Bluetooth Soundtrack: Dual Track Bluetooth Version: V5.0 Usage: Mobile Phone, Call Center, MP3 & MP4, Computer, Game Player, Aviation, DJ Style: In-ear Use: Portable Media Player, Mobile Phone, Computer, Ect Operation Range: 15 Meters(Open Space with on Obstacle) Bluetooth Standard: V5.0 Charging Case Battery: 380mAh Earphone Battery Capacity: 43mAh Music Time(Stereo Mode): about 4 Hours Charging Time(Case/Earbuds): about 2hours Standby Time: about 150 Hours Battery Type: Li-ion Total Battery Life(with Case): about 15 Hours Bluetooth Profile: Hsp, Hfp, A2dp, Avrcp Sensitivity: 105