Ports: 2 micro USB 2.0 port, Connectivity: USB connectivity to PC and IP phone, Lights: Integrated busylight LED indicator, Talk time: up to 8 hours, Standby time: 54 hours, Wireless range: up to 120m/394 feet, Microphone type: Dual microphone. With Yealink Acoustic Shield technology, the headsets could well filter out background noise by 2x microphones while you are on a call, which provides a HD voice quality for your listeners, and ensures distraction-free conversation.