Global Cache GC-BL2 IR Blaster Infrared Signal Extender for GC-100 Devices The GC-BL2 is an IR Blaster that works with GC-100 Network Adapters to transmit IR signals up to 40 feet across a room. The GC-BL2 requires no power supply or connecting block and is the perfect solution for installations where IR signal strength is a problem. Plug-and-play design makes for quick and easy operation. Frequency range of 30  500 kHz. Standard 3.5mm stereo plug and 6 foot cable.