This is the @Fishman_Music Blackstack magnetic soundhole pickups.

Choosing the Right Acoustic Guitar Pickup: Soundhole vs Transducer vs Mic vs Piezo | Reverb Demo

This is Fishman's BEST Acoustic Soundhole Pickup!

Planet Waves Soundhole Tuner

Passive Magnetic Soundhole Pickup Comparison FISHMAN | MOJOTONE | K&K Double Helix Acoustic Pickups

NS Micro Soundhole Tuner from D'Adarrio

Soundhole - Work To Do - 11/26/1974 - Winterland (Official)