USB Headset Single Ear Bluetooth Noise Canceling Adjustable Customer Service Headphone with Microphone            Feature:      1. Built in voice noise reduction processor, using intelligent voice algorithm, using noise reduction technology to eliminate background noise.       2. Uses a new generation of bluetooth 5.0 technology, with faster transmission speed, enabling us to transmit sound and information more easily and quickly.       3. Computer headset microphone pole can be adjusted, can be freely bent inside and outside to achieve precise adjustment of microphone position, suitable for everyone to wear.       4. Adopts high quality manganese steel headband, adjustable and retractable, thus adapting to the size of the head, easy to adjust and reduce the pressure, any expansion does not scratch the hand.         5. Adopts ergonomic design, the boom can be rotated 90 degrees, the microphone pole can be rotated 180 degrees, the sound output is clearer calls, stable and durable.      Specification:      Item Type: USB Headset Material: ABS Working Time: 18 Hours Standby Time: 380 Hours Operating Environment: Temperature: 0°C to 40°C Humidity: 0% to 85%RH Bluetooth Version: V5.0 Frequency Range: 2.4GHz to 2.480GHz Transmission Distance: Approx. 10m/32.8ft (Transmission Distance Varies Depending on Environmental Factors and Mobile Bluetooth Devices) Support Protocol: HFPV1.6, HSPV1.2, A2DPV1.2, AVRCPV1.4 Charging Interface: Type C Interface Built in Lithium Battery Capacity: 150mAh(included) SNR: ≥50DB Frequency Response Range: 50Hz to 18KHz         Package List:   1 x Headphone   1 x Charging Cable   1 x Instruction Manual