MuLife 4 Port USB Hub LED Luminous Fluorescent Message Board Digital Alarm Clock DIY Memo Borad with USB Cable - Blue Fully compliant with USB 2.0 specification Time switchable: 12H/ 24H format Fluorescent light message board: write messages or draw pictures Size: 138*65*116mm.Memo board with highlighter matched. USB hub: with 4 ports USB 2.0 hub.Power supply: USB charging port or 3*AAA battery (Batteries not included).