Usage Tips:Featuring high-precision CMOS chip, this timer is highly resistant to interference. You can set up to 16 on/off programs per day and it is programmable and easy to use. Designed to be easy to read and operate, this time switch features a clear LCD screen and LED indicators. There is a built-in battery that can back up saved programs if the power goes off. Made of premium plastic material, this time switch has sturdy construction, which has a long service life. The length of the timer switch is 60mm, the width is 60mm, and the height is 30mm. You can use this timer to turn on/off any electrical equipment, such as street lamp, billboard, test instruments, etc. Item Name: Time Switch Material: Plastic Model: TM618N Travel Time Error: 1s/24h Working Voltage: DC 12V Power Failure Memory: 180 Days Setting Time: 1 Minute - 168 Hours Control Output: 16A (Supporting Expansion) Setting Times: 16 Times of Switch (Day/Week) Battery: 1 x 1.2V 40mAh Button Battery (Included) Features: Accurate Timing, Programmable, Program Backup Size Details: 60mm x 60mm x 30mm/2.36" x 2.36" x 1.18" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Time Switch 1 x English Manual