ZipyLife CHILL OUT . System type: 1.0, Recommended usage: mobile phone/smartphone, Driver size: 40 mm. RMS rated power: 3 W, Frequency range: 80 - 20000 Hz, Impedance: 4 Ом. Connectivity technology: Wired, Interface: 3.5 mm. Power source type: AC, USB, Battery voltage: 3.7 V, Battery technology: Lithium Polymer (LiPo). Width: 70 mm, Depth: 70 mm, Height: 37 mm