Noise-Canceling Headphones with built in battery

Features

1.Active noise canceling technology headphone
2.Compact, light, and portable device
3.High fidelity sound recovery
4.With Li-ion battery inside
5.High capacity battery
6.Easy and comfortable for using in any audio application

General specification

1.Frequency Range: 20Hz ~ 20KHz
2.Impedance: 32W
3.Sensitivity: 115dB/mW
4.S/N ratio: 110dB
5.Battery operating time: 20Hours
6.Accessory: phone connector cable, USB charging cable