Parameter:Charging voltage 5vCharging Current : 800MAOperating voltage : 3.5V a 4.2VBattery capacity .4000MAHOutput conversion rate : 80%Charging time: 8-10 hoursProduct Dimensions : 29x29x137mmApplication type: mobile phone / MP3 / MP4Power : 42WDistortion : 2% THDAuxiliary audio into : Phone / MP3 / MP4Feature 1: speaker functionFeature 2: promotional gift power bankFeature 3: Support custom logo and packingBattery Type: Li-Polymer BatterySpeaker Power: 2WMaterial: ABS Plastic + RubberPackage:1*speaker1*audio line1*usb line