The StopWatch App Professional runs on following Garmin wearables: 

• Approach® S50, Approach® S60,  Approach® S62
• Approach® S70 42mm and 47mm
• Captain Marvel
• Darth Vader™
• D2™ Air, D2™ Air X10
• D2™ Bravo, D2™ Bravo Titanium
• D2® Charlie 
• D2™ Delta, D2™ Delta PX and D2™ Delta S
• D2™ Mach 1
• Descent™  G2
• Descent™ MK1, Descent™ MK2, Descent™ MK2s
• Epix™
• Epix 2™
• ForeAthlete® 230J, 235J, 630J, 735XTJ and 920XTJ
• Forerunner® 55, 165, 165 Music, 230, 235, 245, 245 Music, 255, 255 Music, 265 and 265s
• Forerunner® 630, 645, 645 Music, 735XT,  745, 920XT, 935, 945, 945LTE, 955 and 965
• Fēnix® 3, Fēnix® 3 HR, Fēnix® Chronos
• Fēnix® 5, Fēnix® 5S, and Fēnix® 5X
• Fēnix® 5 Plus, Fēnix® 5S Plus, and Fēnix® 5X Plus
• Fēnix® 6, Fēnix® 6 Pro
• Fēnix® 6S, Fēnix® 6s Pro 
• Fēnix® 6x Pro/6x Sapphire/6x Pro Solar
• Fenix® 7, Fenix® 7s and Fenix® 7x
• Fenix® 7 Pro, Fenix® 7s Pro and Fenix® 7x Pro
• First Avenger
• MARQ™ Adventurer, Athlete, Aviator, Captain, Commander, Driver, Expedition and Golfer
• Rey™
• Tactix® Delta Sapphire
• Venu™ and Venu™ Mercedes-Benz® Collection
• Venu™ SQ and Venu™ SQ Music
• Venu™ SQ 2 and Venu™ SQ 2 Music
• Venu™ 2 and Venu™ 2s
• Venu™ 3 and Venu™ 3s
• Venu™ 2 Plus
• Vivoactive™, Vivoactive™ HR, Vivoactive® 3,Vivoactive® 3 Music and Vivoactive® 3 Music LTE
• Vivoactive® 3 Mercedes-Benz® Collection
• Vivoactive® 4S and Vivoactive® 4
• Vivoactive® 5