Bluetooth Specifications: V5.0, dual mode, downward compatible. (Connects to a Bluetooth enabled device) Frequency Range: 2.4GHz-2.48GHz Support Protocols: A2DP, AVRCP, HFP, AAC, etc. Transmission distance: up to 30 meters (Transmission distance varies on the environment and Bluetooth device) Speaker Frequency: 20Hz-20KHz, Hi-fi Microphone: Directional Noise reduction microphone Acoustic Noise Cancelling Structure Crystal clear sound and voice (DSP) Headset Battery Type: Lithium-ion polymer Battery Capacity: 320mAh Charging Voltage: 5V DC Life time: Minimum recharging 1000times Operating Temperature:-10 to +60 Degree Charging Time: 2 hours Charging Interface: Micro USB Pair with 2 Bluetooth devices simultaneously Maximum Talk Tim: 20 hours Standby Time: 200 hours Charging Time: 2 hours Operating systems compatibility: Windows/MAC/Linux Software compatibility: Skype, Zoom, Microsoft Teams and other video conferencing software