Up to seven hours of playback time and five hours of talk mode are possible. The package includes a charging cable, an aux cable, and one pair of original T11 headphones. There are two charging cords. Two to three hours. Response to frequency: 20 Hz to 20 kHz. 32 ohms is the impedance. Attenuation: 108 decibels. Extremely sensitive to a loud, distinct sound Headphones Unit Driver 40mm headphones. Response to Frequency: 20 Hz to 22 kHz. The 3.5mm plug connector is included. Compatible with mobile phones, MP3 players, iPhones, Android phones, and more. Bluetooth headphones can be used in the office, on the road, at home, and more. Music is available everywhere.