How do you use this mechanical light switch timer? : r/whatisthisthing
Timer for 4-way switch
BN-Link 7 Day Programmable in-Wall Timer Switch for Lights, Fans and Motors, Single Pole and 3 Way (Compatible with SPDT) Both Use, Neutral Wire Required, White (Blue Backlight) - - Amazon.com
Woods 6.4 Amp 7-Day In-Wall Programmable Indoor Digital Timer Switch with No Neutral Wire, White 59020WD - The Home Depot
Timer Light Switch | Leviton
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SmartExhaust ventilation control, timer and light switch
Light Switch Timer - Police Approved Retro Fit Timer Switch
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