What's your animal spirit: Frog, Bird, Cat, or Bunny? These kid friendly plush 3.5mm audio plug compatible speakers last up to 4 hours and work with almost any audio-out device, whether it's your smart phone, laptop or old school Walkman. Built-in lithium ion rechargeable battery refill via USB cable. You admittedly won't be bathed in audiophile sound, but you should expect a few coos of "so cute!" in stereo from all around.