XANTECH CB20 1-Zone Connecting Block Connects 2 emitter ports and power supply to Xantech infrared receivers that use a stereo mini plug 3.5-millimeter stereo mini jack for quick-connect infrared receivers Contains a 470-Ohm resistor in series with each out jack Two 3.5-millimeter mono mini jacks with 470W resistors drive 2 single or 2 dual emitters 2.1-millimeter coaxial power jack Uses either the Xantech 781RG or 78200 power supply