Annengjin&reg; USB Aroma diffuser with digital clock and coloured lights With digital clock and coloured light. Chromotherapy: gentle illumination that gradually changes colour (seven colours effect that alternate automatically). Clock with backlit LCD, showing date and time. Perfume diffuser with On/Off switch (the USB connection is required for the aroma diffusion function). Power By: USB and 3 battery AAA (battery not included).