High quality Bluetooth v.5.0 stereo headphones. Built-in microphone allows you to make phone calls and talk through internet communicators. High capacity battery allows you to make long phone calls or listen to your favorite music. Easy adjustable, elastic headband. Big, soft ear cushions are covered with noise canceling leatherette material. Perfect for long journeys, at work and in everyday use. TECHNICAL DATA: Bluetooth: v.5.0 Supports Bluetooth profiles: HFP,HSP,A2DP and AVRCP. Bluetooth frequency: : 2,4022,480 GHz Built-in TF card (microSD) slot. Operating distance: up to 10m. Built-in rechargeable Li-Poly battery 250mAh. Talking time: up to 10h Music playing time: up to 7h Input voltage: 5V DC with microUSB cable. Charging time: around 2h Soft ear cushions. Impedance: 32. Frequency range: 20Hz-20.000Hz