XO BS31 Open Air Conduction Bluetooth Earphones

Earphone type: magnetic suction ear type Bluetooth solution: AB5616T Bluetooth version: Bluetooth V5.1 Bluetooth operating frequency: 2.402GHZ-2.480GHZ Horn power: Rating 3-5 mW Frequency response: 50Hz~20KHz Speaker unit: horn Φ 10mm @16ohm Microphone: condenser microphone, -40dB ± 2 Internal batte