Free the Dot 4 from the power outlet using our battery charger This rechargeable battery dock will make your Dot 4 a wireless portable speaker. Maintains Dot 4's original sound quality: the open design of our Dot battery dock ensures no blocking or interference of sound quality, no sound loss. Extended battery capacity: this 5200 capacity battery charger can be fully charged in only 3.5 hours. The built-in smart charging chip allows you to plug in your Dot 4 for an extended period without causing damage to the battery. Very easy to install your dot Plug and play, no complicated buttons, no more messy cables. Simply press your dot to our dot accessory, press and hold the power button for about 2 seconds, then you are ready to go.