Fangrui Product Details You Can Use The Timer To Switch On/off Any Electrical Equipments At A Preset Timer 16 On/off Programs Per Day, 15 Combinations To A Week. 24 Hours / 7 Days A Week Programmable. Built-in Battery For Backup The Memory (save The Programs You Set)when Power Failure Auto Time Error Correction +/- 30 Sec, Weekly Repeat Programs With 16 On/off Settings, And Setting On/off Manually Easy To Read Lcd Display, Led Indicators Countdown Off Time Range 1 Minute To 24 Hours Multipurpose 7 Days Progrmmalbe Timer Switch Has Five Functions: 1. Clock Display (12/24hr Format) 2. Timer (7 Days Programmable) 3. Countdown 4. Auto Time Deflection Correction, Weekly 5. Sleep Mode Usage: The Tm618 Timer Module Can Open Or Close Kinds Of Electrical Apparatus And Power Automatically, According To The Preset Time,the Items Can Be Streetlight, Neon Light (sign), Billboard, Electrical Appliances, Broadcast Equipments Etc., The Digital Timer Switch Is Within Rechargeable Battery, In 1.2v/40ma, High-accuracy Cmos Chip, Strongly Anti-ja