Specification: Item Type: USB Headset_x000D_Material: ABS_x000D_Working Time: 18 Hours_x000D_Standby Time: 380 Hours_x000D_Operating Environment: Temperature: 0C to 40C_x000D_Humidity: 0% to 85%RH_x000D_Bluetooth Version: V5.0_x000D_Frequency Range: 2.4GHz to 2.480GHz_x000D_Transmission Distance: Approx. 10m/32.8ft (Transmission Distance Varies Depending on Environmental Factors and Mobile Bluetooth Devices)_x000D_Support Protocol: HFPV1.6, HSPV1.2, A2DPV1.2, AVRCPV1.4_x000D_Charging Interface: Type C Interface_x000D_Built in Lithium Battery Capacity: 150mAh(included)_x000D_SNR: 50DB_x000D_Frequency Response Range: 50Hz to 18KHz Features: 1NOISE REDUCTION: Call center headset built in voice noise reduction processor, using intelligent voice algorithm, using noise reduction technology to eliminate background noise. 2BLUETOOTH 5.0: Office headset uses a new generation of bluetooth 5.0 technology, with faster transmission speed, enabling us to transmit sound and information more easily and quickly. 3ADJUSTABLE MICROPHONE POLE: 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. 4RETRACTABLE HEADBAND: USB headset 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. 5ROTATABLE: Customer service headphone 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. PackageList: 1 x Headphone 1 x Charging Cable 1 x Instruction Manual