Main Features:● Mini appearance of fashion, easy to carry● Compatible with any 3.5 mm audio output with digital mini speaker ( as for iPhone, tablet PC, student dictionaries, reading machines, etc )● Foldable speaker, you can use it as a phone holder● Powered by USB charging cable● Connect one end of the audio cable to your computer or MP3 for audio output port, put the other end of the product is audio jack, so it can work Model: HP - 20 Design: Cool,Portable,Stylish Compatible with: iPhone,iPod,MP3 Supports: Loudspeaker Connection: Wired Interface: 3.5mm Audio Audio Source: Electronic Products with 3.5mm Plug Color: Blue,Green,Orange,Purple,Red,White,Yellow Speaker Impedance: 4 ohm Power Output: 3W S/N: 85dB Charging Voltage: 5V Charging time: 3 hours Lasting Time: 6 hours Battery Capacity: 300mA Battery Type: Lithium ion battery Battery Voltage: 3.7V Package weight: 0.163 kg Product size (L x W x H): 7.00 x 7.00 x 5.50 cm / 2.76 x 2.76 x 2.17 inches Package size (L x W x H): 7.50 x 7.50 x 11.00 cm / 2.95 x 2.95 x 4.33 inches Package Contents: 1 x Stereo Speaker, 1 x USB Cable, 1 x 3.5mm Audio Cable