The CS1734B is 4-port KVM switch 
Combined with a 2-port USB 2.0 hub. As a KVM switch, it allows users to access four computers from a single keyboard, monitor, and mouse console. There are three methods to obtain instant access to any computer in your installation: Manual, Hotkey, OSD, and mouse.
Features:
- 4-port KVM switch with USB 2.0 support and 2.1 surround sound audio
 - One console controls four computers and two additional USB devices
 - 2-port USB 2.0 hub built in
 - USB 2.0 compliant
 - Dual interface - supports computers with PS/2 or USB keyboard and mouse configurations
 - Audio enabled - full bass response provides a rich experience for 2.1 surround sound systems
 - Console audio ports on front panel for easy access - ideal for IP phone users
 - Supports both USB and PS/2 keyboards and mice - flexible configurations available with the included USB-to-PS/2 converter: USB keyboard and mouse; PS/2 keyboard and mouse; or PS/2 keyboard and USB mouse
 - Independent switching of KVM, USB, and Audio focus
 - Superior video quality; 2048 x 1536; DDC2B
 - Supports widescreen resolutions
 - Computer selection via front panel pushbuttons, multilingual OSD (On Screen Display), and mouse
 - Multiplatform support - Windows , Mac, and Sun
 - Console mouse port emulation / bypass feature supports full mouse driver and multifunction mice
 - Video DynaSync- stores the console monitor's EDID (Extended Display Identification Data) to optimize display resolution
 - Complete keyboard emulation for error-free booting
 - Sun/Mac keyboard support and emulation*
 - Auto Scan Mode for monitoring all computers
 - LED Display for easy status monitoring
 - Easy installation no software required
 - Firmware upgrade-able
*1.PC keyboard combinations emulate Sun/Mac keyboards
  2.Sun/Mac keyboards only work with their own computers 
Package Contents:
- 1x 4-Port USB 2.0 KVMP Switch
 - 4x Custom USB/VGA KVM Cable Sets
 - 1x USB-to-PS/2 Converter
 - 2x OSD/Hotkey Stickers
 - 1x Firmware Upgrade Cable
 - 1x Power Adapter
 - 1x User Manual
 - 1x Quick Start Guide
 
Diagram:

Specifications:
| Computer Connections  | 
4 | 
| Port Selection  | 
OSD; Hotkey; Pushbutton; Mouse | 
| Connectors | 
Console Port | 
Keyboard | 
1 x USB Type A Female (Black) | 
| Video | 
1 x HDB-15 Female (Blue) | 
| Mouse | 
1 x USB Type A Female (Black) | 
| Speaker  | 
2 x Mini Stereo Jack Female (Green) | 
| Mic. | 
2 x Mini Stereo Jack Female (Pink) | 
| KVM Port | 
Keyboard | 
4 x SPHD-15 Female (Yellow) | 
| Video | 
| Mouse | 
| Speaker  | 
4 x Mini Stereo Jack Female (Green) | 
| Mic. | 
4 x Mini Stereo Jack Female (Pink) | 
| Firmware upgrade | 
1 x 4-conductor 3.5mm Jack (Black) | 
| Power | 
1 x DC Jack | 
| USB Hub | 
2 x USB Type A Female (White) | 
| Switches | 
Selected | 
4 x Pushbutton | 
| LEDs | 
On Line/ Selected | 
4 (Orange) | 
| USB Link | 
4 (Green) | 
| Emulation  | 
Keyboard / Mouse | 
PS/2; USB | 
| Video | 
2048 x 1536 @ 60Hz; DDC2B | 
| Scan Interval | 
1-255 seconds (Default: 5 sec.) | 
| Power Consumption  | 
DC5.3V, 3.4W | 
| Environment | 
Operating Temp. | 
0-50 Degree C | 
| Storage Temp. | 
-20-60 Degree C | 
| Humidity | 
0-80% RH, Non-condensing | 
| Physical Properties | 
Housing | 
Metal | 
| Weight | 
0.78 kg | 
| Dimensions ( L x W x H ) | 
21.00 x 8.70 x 5.50 cm |