Tira-2.1: Infrared Receiver/Transmitter for PC control. Connects to your PC via USB cable (included) Dimensions: L 2.5"x W 1.5" , Weight: 35 g. Computer Interface: USB 1.1 IR modulation frequency: Long Range Receiver: 36-40kHz short range receiver: 18-80kHz transmitter: 18-80kHz Distance from remote control: 8-12 meters Required Software: EventGhost or Girder