The RF-250 is ideal for auditoriums, conference rooms, training rooms - anywhere you use a Windows or Macintosh computer in front of an audience.Features:2-way digital wireless communicationReliable operation at 100 feet (31 meters)104 full-sized keysFamiliar mouse touchpad and removable wrist resthot pluggable PS/2 mouseport for standard or wheel mouse32,000+ digital addressesSleep mode for 250 hours operation on two AA (UM-3) batteriesNo software to installIndustry-standard USB connection to computer