1. Connecting the power, the yellow light is turn ON when the voltage is at 175 Vac ~ 260 Vac. After delay around 5 minutes, or you can press the ON & OFF button directly, the green light is always ON, and the power starts to output voltage; 2. After the power supply is connected, when the voltage is lower than 175 Vac or higher than 260 Vac, it enters the voltage protection mode directly. At this time, the red light is always ON, and the power supply is not output; 3. When the product is in the protection mode (the red light is ON), if the voltage higher than 190 Vac or the high voltage drops below than 240 Vac, the yellow light will be ON, and it will enter the normal working status after a delay of about 5 minutes; 4. The ON & OFF button works only when the voltage is in the normal working range; If in the voltage protection mode, the ON & OFF button will be no action; 5. When the product enters the normal status, if the voltage unstable, and it's out of the normal voltage range, the product will enter the voltage protection mode directly and device is no power output. DELAY TIME:5~6 Minutes POWER:3680W MAX VOLTAGE PROTECT RANGE:170V~260V Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on Colour:White Material:plastic Voltage: AC 220V Package Contents: 2 x Voltage Protector Socket Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.