Lenovo Go Wireless ANC, Wired & Wireless, 20 - 20000 Hz, Office/Call center, 8.11 oz (230 g), Headset, Gray Lenovo Go Wireless ANC. Product type: Headset. Connectivity technology: Wired & Wireless, Bluetooth. Recommended usage: Office/Call center. Headphone frequency: 20 - 20000 Hz. Wireless range: 393.7" (10 m). Cable length: 51.2" (1.3 m). Weight: 8.11 oz (230 g). Product color: Gray