EASY PROGRAM: Press timer switch buttons for the duration you want device to stay on. Such as, press 1hr and 30mins button to set 1.5-hour countdown. REPEAT button will run the same countdown daily, ON/OFF button lets you control it instantaneously CUSTOMIZABLE TIMER: Countdown timer gives you complete control over when your lights or fans turn on and off. By combining multiple time buttons, create a variety of countdown times up to 4 hours, it effortlessly adapts to your unique needs SAVING ENERGY: Say goodbye to wasted energy and high electric bills. The digital timer switch automatically turns off lights and fans after the set time, helping you save both energy and money ADAPTABLE USES: Replace most wall switches, supports 1/2HP and rated at 15A/125V/1875W for general use. Perfect for lights, ceiling fans, bathroom exhaust fans and heaters, and any other appliances that are usually forgotten EASY TO INSTALL: Electrical timer switch support side and back wiring. Come with screwless wall plate, sleek and smooth modern style for a clean, modern finish to your installation, is ideal for use in bathroom, closet, pantry, garage, or laundry room WORRY-FREE SERVICE: We offer 1 year replacement guarantee for our programmable light switch(Non-human damage). If you have any questions about the product, please contact us, we will reply you within 24 hours