Product Functions: Electronic Circulating Pipeline Fish Tank, Underwater Color Lamp, Multifunctional Penholder, Color Backlight/Time/Date/Temperature/Display, Alarm Clock Sleeping Product size: 24 (L) * 10 (W) * 19 (H) cm Product color: black/white Distribution: 1 bag of pebbles, 1 USB cable, 1 aquatic plant This machine is powered by three AA batteries and USB5V. Characteristic: 1. The aquarium has its own pump, water circulation in the tank, and the tap running water is oxygenated, and the use of an open type greatly improves the supply of oxygen in the cylinder! There is a filter sponge at the bottom of the tank! No need to change, easy to change and wash! (No need to install, just go home and fill the water. 2. Flow Mini-aquarium (with circulating water system in the aquarium) 3. LED color lamp transparent LCD calendar: time/date/week/temperature/alarm/built-in natural music 4. USB/DC power supply, practical multi-functional transparent penholder, can also be used for green planting.