Marmitek Wireless Speakers: Speaker Anywhere400. RMS rated power: 24 W, Sensitivity: 65 dB, Signal-to-Noise Ratio (SNR): 50 dB. Battery technology: Alkaline, Battery type: D. Type: Portable speakers, Dimensions (WxDxH): 100 x 100 x 37 mm, Audio output channels: 2.0