1.Sponge Design Portable Mini Speaker 2.Built-in Li-ion battery 3.Excellent for Ipod/Mobile/MP3/MP4 4.OEM manufacturer Promotional Sponge Design Portable Mini Speaker for Ipod/Mobile phone/MP3/MP4Working power:1.5WFrequency response: 800HZ-10KHZLi-ion input:3.7V,100MACord plug: Stereo 3.5MM Dimension: 50*51*50mm *2Accessories:Audio cable + charge cable Mushroom Sponge Mini Speaker