The DirecTV PI-21 21v 1.51 PI-21 Power Inserter is designed for use on the SWiMLine dish. It has simply two coax ports, one to the receivers and one to the switch/LNB. The powered-output is colored red and is labeled SWM, to feed the switch/LNB. The other port is labeled IRD to feed receivers. Power Inserter: The SWM switch requires more power than the receivers provide for traditional LNBs or switches. DirecTV includes a power inserter with each SWM unit. This simply plugs in to standard electrical outlet IN-DOORS and feeds power to the switch or LNB. Features: Frequency Range 2-2150MHz can be used for the SWM-8 UL Listed Output 21v/ 1.2A max/ 25.2W max. Input 100~120Vac/ 60Hz/ 0.6A max/ 30W max Insertion loss 1.5db typ.