Gotcha Sprayer Pro is the Dark Orange Model versus the
Gotcha Sprayer which is the Yellow Model. As far as I can tell, the Gotcha Sprayer Yellow Model doesn't exist. Maybe it is now the Green Model.
http://gotchasprayer.com/GotchaSprayerPro.htm

Shows Gotcha Sprayer Yellow Model but says it is Pro Orange Model for 33 dollars
https://pestcontrolbuzz.com/gotcha-sprayer-pro/

Gotcha Home Owner is the Green Model. Could this be the Yellow Model?
It's price is 26 dollars.
https://pestcontrolbuzz.com/gotcha-sprayer-homeowner/

Shows Gotcha Sprayer Yellow Model but says it is Pro Orange Model for 38 dollars. Has flashlight ring. But does it come with a flash light? Is this just the Green Model with a flash light adapter?
https://pestcontrolbuzz.com/gotcha-sprayer-pro-flash/

Red Model for testing fire alarms. Doesn't seem to be available in the store. Not sure if this is just the same thing as the Green Model. Is the Yellow, Green and Red Models just the same model? The Red Model looks a bit different. Not sure with model would be best for spraying paid. Orange, Yellow, Green or Red???
http://gotchasprayer.com/FireSafety.htm

Shows Gotcha Sprayer Yellow Model but says it is Pro Orange Model for 33 dollars
https://www.ebay.com/p/1801509723?iid=184034282928

Shows Gotcha Sprayer Yellow Model but says it is Pro Orange Model for 60 dollars
https://www.amazon.ca/4most-Innovations-GSP0205-Gotcha-Sprayer/dp/B0042T5PBO