Yealink CP900 is the high-performance portable speakerphone that is flexible and scalable for the meetings of up to 6 people. 300-900-001 Features: Speakerphone size: 132.5 x 35.5mm 8 touch buttons Connectivity: USB 2.0 PNP & Bluetooth USB cable length: 0.9 meter Built-in Bluetooth 4.0 Wireless range: 30 m Power: USB/Lithium Polymer Battery Battery: Capacity: 3.85V/2450mAh Charging time/power: 5 hours (USB 5V/500mA Talk time: 12 hours Standby time: 450 days Microphone: Type: MEMS MIC (Analog) Sensitivity: -42dB re. 1V/Pa Signal to Noise Ratio (SNR): +59 dB Frequency range - Conference mode:USB mode & Bluetooth mode 115 Hz to 7 KHz Speaker: Peak output power: 7W Root Mean Square (RMS): 3W Sensitivity: 82 dB SPL +/-3dB SPL @1m, 1W Frequency range – Conference mode: USB mode & Bluetooth mode 100 Hz to 8 KHz Frequency range – Music mode: USB mode 115 Hz to 16 KHz Bluetooth mode 115 Hz to 8 KHz Audio: Optima HD voice Microphone pickup 2 meters Full-duplex technology Noise suppression (NS) Digital Signal Processing (DSP) Acoustic echo cancellation (AEC)