JBL On Stage Micro II, On Time. Audio output channels: 2.0, RMS rated power: 4 W, Frequency response: 70 - 20000 Hz. Battery type: AAA. Weight: 300 g. Colour of product: Black. Compatible products: iPod (nano G3, iPod classic, iPod touch), iPhone, MP3, CD, PC, Depth: 150 mm, Height: 38 mm