Dual channelWorking time: more than 10 hours (depends on battery)Output: 1W + 1W3.5mm standard connector2 speakers: 28mm in diameterFrequency range: 200Hz - 20kHzNet weight: 40g or 1.41ozSize: 80 x 80 x 30 mm (3.35 x 3.35 x 1.18 in)Impedance: 8ohmPowered by 2 AAA 3V batteries (not included)Compatible with: iPhone， iPod， Nano， MP3， MP4， etc.all devices with 3.5mm connectorPackage includes:1x Mini Stereo Speaker