This is a portable dock speaker made by Sony. It is the RDP-NWT19 L. The color is blue. Features: Portable size for easy carrying. Can charge the "Walkman" while playing with the included AC adapter. Convenient dual power supply: AC adapter for indoor use, and power supply from the "Walkman" for outdoor use. Please refer to https://www.sony.jp/support/active-speaker/dock/comfirm/rdpnwt19.html for compatible models. Included accessories: AC power adapter. This is a used item. Operation has been confirmed.