Bluetooth SIN CABLE Headphone with built-in microphone Account with button to attend calls. Bluetooth 4.1 wireless connectivity up to 10 meters. Charge via connection MicroUSB (DC5V-500mA) Lithium polymer battery. And case inside which you can load the battery of the headphones. – Operating range: 10m – Frequency response: 20Hz-20KHz – Voltage input: DC 5V/500mA – Usage time calls: 2.5h – Wait time: 2dias – Loading time: 1.5h (loading box)