Well, according to EMG, "The 81TW humbucker doubles down on tone, taking the EMG 81 and adding a separate single coil pickup in the same housing. This is not your traditional coil-tap humbucker. EMG has designed the dual-mode to allow for maximum flexibility, featuring two pickups in one humbucker. The original 81 provides all the crunch and attack it's famous for and the additional single-coil now gives players two classic tonal options to choose from. Either mode is accessed through a push/pull pot for ease and versatility...."
The neck pickup is an 89. "Featuring two pickups in one, the 89 houses separate preamps and coils for a custom humbucker and single coil sound at your fingertips. Loaded with Alnico V magnets, the humbucker sound is rich, warm and powerful, but still clear and articulate, similar to the 85. The single coil mode, accessed via the included push pull pot, delivers the traditional Strat single coil sound: bright, airy, and chimey, and is very similar to the EMG SA. In either mode, the clean sound is gorgeously pristine and has a lot of presence. Used equally in bridge and neck positions. Whether you are playing hard rock or jazz, you can get it all with this beautifully balanced and versatile pickup..."
The amazing thing is even in single coil mode, it's quiet, yet it has the capability of the really clear and sparkly Stratocaster tones.
I've now owned two Hellraisers, a 2005 pre-release production sample and this 2019. Both were flawlessly setup. No additional work had to be done. They were stage ready right out of the box.
So, when I am hired to play on a recording and I am traveling, I always take the Hellraiser because of its versatility.