The dimensions for the Travel Mini are 2.5"L x 2.5"W x 1.77"H. We will have the sounds files uploaded to the website very soon. The main differences between the Travel Mini and the Rohm/Hushh are the dimmable nightlight feature, available sound options, and size. The Travel Mini is slightly smaller in size than the Rohm and Hushh and offers 6 different sound options as opposed to the 3 sound options available on the Rohm/Hushh.
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The battery is a rechargeable lithium ion battery. I hope that helps to answer your question and if you need further information please let us know. Thank you.