I enjoy using my iPad for performances but didn't want a pedal for page-turning. I found a small Bluetooth button called Flic that worked for
Bach 36B Stradivarius Professional Trombone - F-Attachment - Clear Lacquer
Thumb Grips
Trombone Bb Pitch Finish Brass Made W/casemp SILVER - Denmark
Flic-grip Shires/edwards .547
Bach 36B Trigger Trombone - Hillje Music Centers
Trigger Grip
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Bach 36B Stradivarius Professional Model Tenor Trombone w/ Traditional F Rotor
1950-1955 Vintage King Cleveland 605 Trombone - .de
Trigger trombone - Österreich
Flic-grip Shires/edwards .547
Deflector Kgumusic for Trombone for Bass Trombone - Israel
Thumb Grips
Trombone Button - UK
Bach 36B Stradivarius Series Trombone