Creative Labs TravelSound ZEN Stone. RMS rated power: 0.4 W, Frequency range: 200 - 20000 Hz, Signal-to-Noise Ratio (SNR): 75 dB. Weight: 160 g. Battery technology: Alkaline, Battery type: AAA, Battery life (max): 21 h. Type: Portable speakers, Dimensions (WxDxH): 173.3 x 57 x 32.7 mm, Audio output channels: 2.0