OVLENG wireless headset $ 17.14 Transmission distance: less than or equal to 10m Battery capacity: 300mAh Charging voltage: DC5V Speaker diameter: 40mm Impedance: 32 Working time: 4-6h playing music, 8-10h talk time Bluetooth version: 5.0 Microphone: Outside Rated power: 100mw Working voltage: DC3.7V Frequency range: 20-20KHz
