Wireless Mini Keyboard with Trackball
Solidtek ACK-573
Infrared, PS/2, Range: 7M (23'), 89-key
WxHxD: 13"1/4x6"5/8x1"1/8
KB-SLT-WLS-TB
Features
* Designed for Windows
* Built-in trackball for mouse emulation
* Wireless input with built-in infrared technology
* 88/89 keys keyboard with embedded numeric keypad and
  12 dedicated function keys
* Fully function of 104/105 keys

Transmitter
* Frequency: 38Khz
* Effective angle: Within 45o
* Distance: 7 meters
* Power: 3VDC(2) 1.5V AA batteries
* Battery: 400 hours with typical usage

Receiver:
* Keyboard interface: IBM AT, PS/2 compatible
* Power: 5V DC, 300mA max. connected to host computer
* LED indicator: Num Lock, Caps, Scroll Lock, Power LED
  and active LED Sensor: High performance and high EMS
  immunity

Trackball:
* Resolution: 200DPI (X, Y Axis)
* Signal output: Shift Sin wave (X, Y Axis)
* Phase shift: 90 + 45o
* Tracking speed: 250mm/sec

Specification
* Compatibility: IBM AT, PS/2, DOSV
* Key layout: 88/89 keys
* Travel distance: 3.0 x 0.3mm
* Travel to peak: 1.0 x 0.3mm
* Peak force: 50 x 10 gm
* Operating temperature: 0 to 40oC
* Storage temperature: -10 to 60oC
* Operating humidity: 10% to 85% RH
* Switch life: 5 million life cycles
* Electronic data: Transmitter--3VDC x 15mA; 
  Receiver-5VCDx250mA
* Dimension : 338(L)x173(W)x35(H)
* Weight: 0.86kg