The GC-BL2 is designed for use with the Global Cach GC-100 Network Adapters to transmit IR signals across a room up to 40 feet. No power supply or connecting block is required for use. With an IR modulation frequency range of 30 - 500 kHz, and transmitting up 40 feet, the GC-BL2 is the obvious solution to any IR signal strength problem. The GC-BL2 employs a standard 3.5mm stereo plug and 6ft cable for easy connection and installation for use with the GC-100 Network Adapter.