Previous page Next page 1 Preset Countdown Timers 2 Save Energy 3 LED Indicator Previous page Next page 1 Installation Steps 2 Package Included The timer switch has 4 wires, must all 4 wires be used when installing? No. The installation can be done without ground wire（green wire).Make sure hot wire,load wire,neutral wire are present in the wall box before purchase. Do I need a white neutral wire in the box? Yes, Neutral wire must required. Will this work without the load wire(red wire)? No.This timer switch will not work without the load wire(red wire). Countdown Timer switch Timer Switch Comparison Countdown Function 5-10-15-30-45-60m Preset Times 5-10-20-30-45-60m Repeat Function Backlight Single-Pole 3-Way Neutral Required Countdown Function 5-10-15-30-45-60m Preset Times 60 Minute Max Dial Repeat Function Backlight Single-Pole 3-Way Neutral Required Countdown Function 5-10-15-30-45-60m Preset Times 18 On/Off programs Repeat Function Backlight Single-Pole 3-Way Neutral Required Countdown Function 5-10-15-30-45-60m Preset Times 18 On/Off programs Repeat Function Backlight Single-Pole 3-Way Neutral Required Previous page Countdown Timer switch Learn More Spring Countdown Timer Learn More Programmable Timer Switch Learn More Astronomical Timer Switch Learn More Next page