This is a great little guitar amp that is small enough to fit in your pocket and its plug and play so no convoluted instructions on how to use it. Charge it with the USB cord it comes with when you first get it and then it is good for around 4 hours usage time. Using headphones you can get in a good practice session without blasting everyone out of the house. The power supply source is a rechargeable battery. This guitar amp even comes with a 6 month warranty. #RankBoosterReview #Sponsored https://www.amazon.com/gp/product/B071FBCZ6Z #MUGIG