Wireless bluetooth headset $ 15.81 Bluetooth version: 5.0 Support range: 2.402- -2.480GHz Packing box size: 19 * 7.2 * 21cm Speaker model: 4083 Speaker size: 40MM Impedance: 32ohm Sensitivity: 118 +/- 3db @ 1KHz Frequency response: 20HZ-20KHZ Rechargeable lithium battery: 3.7V / 200mA Use time: 5-6h
