Creative Labs Speaker TravelDock Station Zen Micro. Magnet type: neodymium. Frequency range: 150 - 20000 Hz, Signal-to-Noise Ratio (SNR): 75 dB. Battery technology: Alkaline, Battery type: 4xAA, Battery life (max): 25 h. Audio output channels: 2.0, Satellite speakers RMS power: 4 W, Power requirements: 5VDC