●Size:15*10*5cm Weight: 400g Resolution: 1920 x 1440 ●4 input and 1 output switcher, compact and unobtrusive for convenience. Easy to install and easy to use ●Easy to switch with a switch. Also equipped with a stereo audio terminal ●This product can use the output of STB/ DVD player and other AV interface to projector/TV/Monitor or other AV interface equipment ●When AV audio and speakers connect to signal source, there is a "boo" sound that is frequently used. This is a normal phenomenon. This does not imply due to the quality of this product. Thank you for your understanding