NEW IN BOX. Sticker on box is broken but they were never used. Over Ear Headset Lightweight, wireless headphones with USB receiver — professional enough for the office, perfect for working from home. USB receiver with a USB-C adapter included Headset Height: 7.20 in (183 mm) Width: 6.68 in (169.7 mm) Depth: 0.2 ft (73 mm) Weight: 6.52 oz (185 g) Ear pad Height: 3.88 in (98.6 mm) Width: 2.97 in (75.4 mm) Depth: 0.76 in (19.3 mm) USB-A Receiver USB-A to USB-C Adapter Microphone Type: Dual omni-directional MEMS mics with directional beamforming and DSP Frequency Response: 100 ~ 8 KHz Speakers Frequency response (music mode): 20 ~ 20 KHz Frequency response (talk mode): 100 ~ 8 KHz Sensitivity: 118.0±3 dB at 1mW @1 kHz Driver size: 1.57 in (40 mm) Battery Built-in battery (Lithium ion) Battery life (talk time): Up to 18 hrs 1Battery life may vary based on users and computing conditions. Battery life (listening time): Up to 20 hrs 2Battery life may vary based on users and computing conditions. Charging cable length USB-A to USB-C charging cable: 4.26 ft (130 cm) Wireless Headset Bluetooth version: 5.2 Receiver Bluetooth version: 5.0 Wireless range: Up to 100 ft /30 m (open field line of sight) 3Wireless range may vary based on users and computing conditions. Works with Windows, Mac, or Chrome based computers via USB-C, USB-A, Bluetooth and Android Bluetooth-enabled devices.