■ Model Number: HDBT37BK ■ JAN Code: 4984279642658 ■ Color: Black ■ Bluetooth: Version: Bluetooth V5.1 ■ Supported Profiles: A2DP, AVRCP, HFP, HSP ■ Supported Codecs: SBC, AAC ■ Output: Class 2 ■ Maximum Communication Distance: 10m ■ Frequency: 2.402GHz – 2.480GHz ■ Length: Approximately 99mm ■ Material: ABS ■ Weight: 15g ■ Battery Capacity: 80mAh ■ Charging Voltage: DC 5V ■ Music Playback Time: Approximately 6 hours ■ Talk Time: Approximately 6 hours ■ Standby Time: 220 hours ■ Earphone Sensitivity: 90dB ■ Impedance: 32Ω ■ Earphone Frequency: 20Hz-20 KHz I'm selling this because I bought a new one. It is a used item.