ENERLITES Countdown Timer Switch for Bathroom Fans and Household Lights, 1-30 Min Settings with Manual Override, Always On Blue LED, Neutral Wire Required, UL Listed, HET06A-R-I, Ivory - Walmart.com
NuTone VS69WH White 15 Minute Bath Fan Timer Switch with Two On/Off Switches - VentingDirect.com
AirCycler Smart Exhaust Bathroom Fan Timer Switch-White SE1-W
Control bath humidity with a medium-tech digital fan timer | Digitized House
7 Button Countdown Timer Switch, Maximum 60 Minutes Delay
I created my own bathroom fan countdown timer switch : r/homeassistant
My dad has a fan timer switch in his bathroom (which also happens to be mounted upside down) : r/mildlyinteresting
GE In-Wall Digital Countdown Timer 15318 - The Home Depot
2x In Wall Switch Gang Countdown Programmable Timer Auto Bathroom Fan LED Light | eBay