These are preowned ANC Active Noise Canceling Over-Ear Wireless Headphones by the brand ANC. They have Bluetooth 5.0 wireless technology and a wireless range of 32.8 feet. The headphones have a headband form factor and come with a USB-C charging port. They have a recharge time of 2 hours and a quick charging time of 10 minutes for 3 hours of use. The earpieces are designed to be worn over the ear and have a dynamic driver type with a size of 1.6 inches. They have an impedance of 32 Ohms and a frequency response of 20 Hz to 20 kHz.