PC via combined USB-A and USB-C cable; smartphone via Bluetooth. Compatible with Windows® or Mac OS. Touch sensitive user controls for Call/answer end, mute, volume +/-, programmable function button, bluetooth pairing. Push button user controls for power on/off, wireless daisy chain. Two highly visible status light bars. One USB-A port for smartphone charging. Kensington lock slot. Bluetooth v5.1. Three microphone steerable array. 8 ft pick up range. Ideal for room sizes up to 5 m x 5 m. 100 Hz to 6.7 kHz frequency response. Full duplex audio. Noise and echo reduction. Loudspeakers 1 x 50 mm high-performance music speaker with 75 Hz to 20 kHz frequency response. Bass reflect with dual passive radiators. 5000 mAH battery capacity. Talk time up to 30h Charge Time of 5h. 41 inch cable length. IP64 dust and water resistant. Compatible with a wide range of platforms. 1.5 x 4.0 x 10.7 in. Sold by each.