Jabra Speak2 75 UC, Dark Grey. Device type: Universal, Product colour: Grey, Signal-to-Noise Ratio (SNR): 72 dB. Frequency range: 80 - 20000 Hz. Microphone frequency: 150 - 14000 Hz. Connectivity technology: Wired & Wireless, Interface: USB/Bluetooth, Bluetooth profiles: A2DP, AVRCP, HFP, HSP. Power source type: Battery, Battery technology: Lithium-Ion (Li-Ion), Battery capacity: 4700 mAh