Appearance Parameters: Product Size: 71*71*175mm Package Size: 98*98*206mm Net Weight 0.85kg Gross Weight: 1.02kg Lithium Battery 7800mAh Material: Aluminium alloy, silicone Speaker: 2*66mm stereo speaker Work Voltage: DC 5V TF, microSD Card Max 32GB Audio Format: MP3 WAV Impedance 4Ω Audio Output: Max Power 3W*2 Frequency Range:150Hz-18KHz Noise-signal ratio>=90db Frequency Range:FM87.5-108MHZ Special Function: Waterproof speaker Song cycle Files switch Delete music Smart button Super silicone button Search local FM Radio Bluetooth phone function Power Bank Charge for mobile phone Powerful and clear