Wireless Single-Ear Headset Compatible with both left and right ears♪ ■ Power: DC5V (USB power supply: microUSB input terminal) ■ Built-in battery: Rechargeable lithium polymer battery (3.7V 250mAh) ■ Charging time: Approximately 2 hours (from empty to full charge) ■ Continuous usage time: Approximately 30 hours maximum (50% volume) ■ Continuous standby time: Approximately 250 hours maximum ■ External dimensions: Width 163.2 x Height 142.2 x Depth 48.5mm (when retracted to minimum) ■ Type: Dynamic type (monaural) ■ Driver unit: 30mm diameter ■ Frequency band: 20～20000Hz ■ Impedance: 32Ω ■ Maximum allowable input: 30mW ≪Bluetooth section≫ ■ Communication method: Bluetooth standard Ver. 5.1 ■ Supported profiles: HSP, HFP, A2DP, AVRCP ■ Supported codecs: SBC, AAC ■ Frequency band: 20～20000Hz ■ Impedance: 2.2kΩ ■ Input sensitivity: -42dB