E-THINKER Ocean Sea Daren Waves LED Night Light Projector Lamp with Loudspeaker for Mobile Phone Material:ABS , Power Source:Electric , Light Source:LED Built-in a mini speaker (via 3.5mm audio jack) Angle adjustment,Automatic OFF function,Swinging filter Size:135*135*125mm , Weight:0.38kg This product is the use of 4 AA batterier, also supports external USB and 4.5V DC plug, automatic sleep function, an hour later automatically closed ( you can also press the key to close it or to open), built-in Mini speaker can be as ipod, mp3 speakers, features intimate and easy to use. Projected swinging light like a ocean surface makes you relax at Bath Room or Living room.