POLY Calisto 5300. Device type: Mobile phone, Product colour: Black, Maximum operating distance: 3 m. Sensitivity: 85.1 dB, Frequency range: 150 - 20000 Hz, Impedance: 4 Ω. Microphone frequency: 100 - 7500 Hz. Connectivity technology: Wireless, USB connector type: USB Type-A. Power source type: Battery, Battery technology: Lithium Polymer (LiPo), Battery capacity: 1000 mAh