This is a Sirius Radio hardwired 5V power adapter that works with all Sirius and XM Radio plug and play receivers. This adapter replaces the cigarette lighter adapter that comes with the vehicle kit. The adapter includes an indicator light to show when the unit is on and working properly. Here is a list of Sirius receivers that work with this adapter. Stiletto 10 - (SL10-PK1)Stiletto 100 - (SL100-PK1)Stiletto 2 - (SL2-PK1)Sportster 3 - (SP3-TK1)Sportster 4 - (SP4-TK1)Sportster 5 - (SP5-TK1)Starmate 3 - (ST3-TK1)Starmate 4 - (ST4-TK1)Starmate 5 - (ST5-TK1)  Stratus SV3 - (SV3-TK1)Stratus 4 - (SV4-TK1)Stratus 5 - (SV5-TK1)InV - (SV2-TK1)InV2 - (SI2-TK1)S50 - (S50-TK1)Stratus 6Starmate 6Starmate 8