1.Built-in Dusk to Dawn Sensor: Attached with this transformer, the outside landscape lighting will turn on automatically at dusk and off at dawn. 100W, convert 120V AC household voltage to 12V DC safety voltage, providing a safer and more practical electrical current level.2.Countdown Timer & Memory Function: Press the select button(Time setting 1) to set 2/4/8/12 hour or the button(Time setting 2) 1/3/5/9 hour countdown easily, so it will turn on at dusk and automatically turn off 2/4/8/12 hour or 1/3/5/9 hour later. There have 2 kind time setting can choose. Memory function, the transformer remains the timer mode you selected before, even when power outage.3.Easy Installation : Built-in hanging hole, mount it on outdoor walls directly. The wiring part must be waterproof treated by the user, protects the transformer from rain, snow, dust and abrasion, withstands years of use.4.Automatic Circuit Breaker: Built-in automatic circuit breaker, it will provide overload and short circuit protection effectively. Compact and lightweight, easily hidden, will not affect the appearance of your yard.5.Wide Application & Waterproof: The 100W low voltage transformer made with high-performance flame retardant material protects the transformer against all severe weather conditions, is corrosion resistant, and withstands years of use. Not only use for SMY Lighting led lights, but compatible with all low voltage DC12V LED landscape lighting, like a spotlight, pathway light, garden light, water feature, etc.