Philips Speaker Dock SBD8100/37, 2.0 channels, 10 W, 80 dB, 4 Ω, 1.57" (4 cm), 100 - 20000 Hz Philips Speaker Dock SBD8100/37. Audio output channels: 2.0 channels, RMS rated power: 10 W, Sensitivity: 80 dB. Apple docking compatibility: iPhone, iPod. Product color: Stainless steel, Magnet type: Neodymium, LED indicators: Power. Power source type: AC, Battery type: AA, Battery voltage: 1.5 V. Weight: 6.17 lbs (2.8 kg), Package width: 8.27" (210 mm), Package depth: 19.1" (485 mm)