... -and-play* USB flash memory, ranging from 0-4G* Black/Silver/Blue etc. 1.COMPONENT Transmitter 1 Receiver 1 Battery2 Manual 1 ... *22cm weight:8kg 5.PRODUCT COLORstock:black, silverorder:black, silver, white, red, blue, green, yellow etc.. 6.ApplicationsTeaching & Presentation,Lecture,Astronomers (Poiting ...