Poly Sync 20: PC via USB-A or USB-C cable (depending on model); smartphone via Bluetooth Poly Sync 20+: PC via USB-A or USB-C cable (depending on model) or wirelessly via included BT600 Bluetooth adapter; smartphone via Bluetooth COMPATIBLE WITH: Windows or Mac OS USER INTERFACE FEATURES Touch sensitive user controls for Call/answer end, Mute, Volume +/-, Programmable function button, Microsoft Teams (Microsoft Teams versions only) Push button user controls for Power On/off, Bluetooth pairing Highly visible status light bar Integrated USB-A or USB-C cable (depending on model) One USB-A port for smartphone charging Bluetooth v5.1: Supported Bluetooth profiles: A2DP, AVRCP, HFP, HSP, and BLE Three microphone steerable array Microphone pickup range: up to 7 ft / 2 m Ideal for room sizes up to 4 m x 4 m Microphone Frequency Response: - 100 Hz to 6.7 kHz Full duplex audio Noise and echo reduction Loudspeakers 1 x 40 mm high-performance music speaker Loudspeaker frequency response: 80 Hz to 20 kHz Bass reflex with dual passive radiators Battery type: Lithium-ion Battery capacity: 3200 mAH Talk time: up to 20 hours Charge time: 4 Hours DIMENSIONS: 34 x 95 x 182 mm, 1.3 x 3.7 x 7.2 in WEIGHT: 360 g / 12.7 oz CABLE LENGTH: 715 mm / 28 in ENVIRONMENTAL: IP64 dust- and water-resistant APPLICATIONS SUPPORTED: Plantronics Hub desktop and mobile versions, Plantronics Manager Pro suites, Asset Management and Adoption