Neewer&reg; Multifunction Portable Cube Electronic Guitar Amplifier Recorder Speaker 5W Guitar Amp Support TF Card Up to 32G for Acoustic, Electric Guitar, Violin (NW-03M) Support TF card up to 32G, and the supporting music format: MP3, WAV, WMA (Supporting TF Card ONLY, TF card NOT included) Independent knobs to control guitar volume and tone Built-in distortion effect Built-in rechargeable battery(5V) ome with a USB cable. It could be powered by PC or power bank through usb cable, and could also be powered by a 5V DC adapter(DC adapter Not included)