The Yealink UH38 Teams Certified Dual Mode Mono Headset with Bluetooth and USB-A Connectivity TEAMS-UH38-M can be powered by the built-in rechargeable battery when in Bluetooth mode, which combines the reliability of wired headsets and the flexibility of wireless headsets. This headset features a 360° busy light it will automatically glow red when you are on the call or in the meeting to reduce external interference and improve work efficiency. The Yealink UH38 supports USB and Bluetooth dual connections, allowing you to manage two call devices simultaneously to improve call processing efficiency. Connects to: IP phones, PC and Mobile Devices How Does it Connect: USB-A, Bluetooth • Dual Noise-Canceling. • Visible Busylight. • Dual Devices Connection. • Built-in Battery. • Built-in Bluetooth 5.1. • Call and Music Mode. QUICK SPECIFICATIONS • Product Type: Headset • Earpiece Type: Stereo • Talk time: up to 7 hours ?9 hours with busylight off? • Music time: 14 hours • Battery capacity: 200 mAh WHAT'S INCLUDED • Yealink UH38 Teams Certified Dual Mode Mono Headset TEAMS-UH38-M • USB 2.0 Cable (USB-A to USB-C/USB-C to USB-C) • Carrying Case • User Guide