The Black Angel™ is a passive magnetic soundhole pickup.
The pickup is quiet and doesn’t sound electric — there’s no hum and no battery. Both coils are on a parallel axis to the strings, featuring a humbucking magnetic circuit that is acoustically isolated to reduce unwanted finger and pick noises. Players who like to mix two or more pickups together will appreciate the built-in phase switch making.

The Black Angel™ ideal for use in any dual or multi source system, and it can be easily combined with any piezo or microphone.
The Black Angel™ installs easily and quickly in the soundhole, with no modification to your guitar, and fits soundholes of 3-1/2 inches (89 mm) and larger. The 2-1⁄16 “E”-to-“E” string spacing on The Black Angel™ easily accommodates guitar nut dimensions ranging from 1-11⁄16 to 1-3⁄4 inches.
Both a 1⁄8-inch to 1⁄4-inch Switchcraft endpin jack (install version) and a quick mount 10-foot cable (standard phone jack) are included with The Black Angel™.

I almost never did used it because I am more a classical guitar player. That is why I am also selling my accoustic Larrivee LS-19