For Efficient Collaboration in Large Conference Rooms Runpu bluetooth portable speaker has immersive call and music sound, and everyone's voice can be heard in the conference call. It is suitable for meeting rooms within 20 ?. Use this wireless portable speaker to turn any room into a conference room. Use it at home, office or travel! ? Model: Bluetooth Conference Microphone Speaker ? Radio radius: 4 meters ? Interface: 2 Function Bluetooth&USB Connect ? Applicable area: within 20 square meters Button: ? Power switch ? Volume control key ? Microphone mute button ? Bluetooth&USB