3 port USB v2.0 hub. USB power supply is up to 500mA. 2 modes of light: night light mode when press once and breathing light mode when press twice. Breathing light mode will go on and off gradually like our breath, helps in creating a relaxing effect. Press three times: Night light off. Plug and play. Supported platforms: Win95/98/ME/2000/XP/Vista/Win7, Linux 2.4, Mac OS 8.5 or later Material: ABS Available colours: White Dimension: 7.6(H)x 7.6(L)x 6.5(W) cm