Features: 1. One button solution can wholly control the device in e-classroom. 2. Build-in hundreds control code of different brands projectors, it is easy to set and use. 3. Using serial port to control projectors, directly and stability. 4. Adopted advanced program, easy to upgrade the chip. 5. Adopted 400mhz broadcast video amplifier, which ensure the high quality of picture even long distance transmission. 6. Build-in digital volume adjustment. 7. Reserve ports of network, microphone, usb, pc, great convenient for operator. 8. Prolong shutdown time to protect the projector. Technical specification: Appearance: metal cuboid box Dimension: 271mmx84mmx124mm Table hole size: 261mmx74mm Input power: ac200-240v, 50/60hz Output power: 4 channel, 5a/each channel Resolution: up to 1600*1200, 75hz Screen power: 2000w Projector power: 2000w Video input/output: 3ways in & 2ways out 1vp-p signal(75ohms), 300m bandwidth Audio input/output: 1vp-p signal level(600ohms), unbalanced) Vga input/output: 3ways in & 2ways out 1vp-p signal level(75ohms), 300m bandwidth S-video input/output: 2ways in & 1way out 1vp-p signal level(75ohms), 300m bandwidth Usb / mic /net: input / output each group Power consumption: less than 15 w Operation temperature: -10¦c-60¦c Supported serial ports parameters: Baud rate: 300-115200bps Parity: no/odd/even Data bit: 7bit or 8bit Stop bit: 1bit Communication: 20 meters