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EPOS EXPAND 20. Device type: Universal, Product color: Black, Silver, Optimized for: UC, Skype for Business. Frequency range: 150 - 15000 Hz. Microphone frequency: 150 - 6800 Hz, Microphone direction type: Omnidirectional. Connectivity technology: Wired, USB connector type: USB Type-A, USB connector gender: Male. Talk time: 20 h, Standby time: 30 h, Battery recharge time: 2.5 h

"EPOS EXPAND 80. Device type: Universal, Product color: Black, Silver, Maximum operating distance: 1181.1"" (30 m). Frequency range: 50 - 20000 Hz. Microphone frequency: 150 - 7500 Hz, Microphone direction type: Omnidirectional. Connectivity technology: Wireless, Interface: USB/Bluetooth, Bluetooth profiles: A2DP, AVCTP, AVDTP, AVRCP, DID, GAVDP, HFP, HSP. Width: 4.67"" (118.6 mm), Depth: 12.4"" (315.6 mm), Height: 1.81"" (46.1 mm)"