The 300W Low Voltage Transformer converts 120V AC household voltage to 12V/14V AC safety voltage, and is intended to provide power to low voltage lighting systems. High performance metal material makes the transformer durable and waterproof, which protects the power supply against bad weather. This power supply can withstand years of use and is perfect for outdoor landscape lighting system. 11 Optional operation modes to suit different needs. ETL Listed & CEC Level VI Certified makes it safe and energy saving. ETL Listed & CEC Level VI Certified: This low voltage transformer is ETL Listed for safety & CEC Level VI Certified for efficiency. (There will be not voltage output when no load is connected to the transformer.) Built-in Dusk to Dawn Sensor: Under 'AUTO ON’ mode, the landscape lighting attached with this transformer will turn on automatically at dusk and off at dawn due to the dusk to dawn sensor. Countdown Timer: With '1-9 HOUR COUNTDOWN’ mode, the transformer will turn on at dusk and automatically turn off 1/2/3/4/5/6/7/8/9 hours later. 'ALWAYS ON’ mode is also available. Easy to Install: With built-in hanging holes, 2.3ft 18AWG fully encapsulated toroid core and mounting hardware, this low voltage transformer can be mounted on outdoor walls easily. This product is covered for 2 years from the date of original purchase. High performance metal material makes the transformer durable and waterproof, which protects the power supply against bad weather. Contact us and we are here to help.