This timer has four screw connector for connecting to a 12 Volt DC system. A wiring diagram is in the images.

Often used to power 12v pumps. For Example, 2minutes on and 360minutes off (6 hours). The top display shows the on time, and the bottom display the off time.

Program instructions below

Specifications:
Working voltage: DC 12V(5V/24V over 100pcs can be customized)
Relay: 20A
Timing range: 0-999 seconds, 0-999 minutes, 0-999 hours
Working mode: delay on, delay-off, timing on, timing off, cycle on, cycle off
Size: 45.5mm*26.5mm*30mm/1.79*1.04*1.18"
Weight: 25g

Product Instructions:
Please pay attention on your first use. You need to wait for 6s after your setting data, the module will save the date you have set after 6s.  
Short press button SET: If you start the time setting mode, the light will blink. You then adjust the time T1 and T2 by button+ and button-. Please wait for 5s after you set the date, the module will save the date you have set after 5s.
Long press button SET: if you start the parameter setting mode. There is two group parameter for your choice: P0 and P1. You could switch P0 or P1 by short press SET. Under the parameters P0 and P1, you can set the timing mode by the button+ and button-.

TIMING MODES
P0--0: Timing time mode : 0---999s.
P0--1: Timing time mode : 0---999min.
P0--2: Timing time mode : 0---999h.

PROGRAM MODES
P1--0: The relay will connect after you delay the T1 time.
P1--1: The relay will disconnect after you delay the T1 time.
P1--2: The relay will connect after you delay the T1 time first, Then the relay will disconnect after you delay the T2 time, it finishes.
P1--3: The relay will disconnect after you delay the T1 time first, Then the relay will connect after you delay the T2 time , it finish.
P1--4: The relay will connect after you delay the T1 time first, Then the relay will disconnect after you delay the T2 time, it is cyclic.
P1--5: The relay will disconnect after you delay the T1 time first, Then the relay will connect after you delay the T2 time, it is cyclic. (*USUAL USE FOR PUMPS)

Example: A customer needs 10 seconds to start up and 20 seconds off. Setup is as follows:
T1 set time 10, T2 set time 20
P0 -- 0 (T1 time range is seconds)
P1--5 (timer work mode)

Included:
1 x T2302 Time Digital Relay