1. Application: For controlling the smooth running of radiotube, water pump, electrical machinery, strip lights, etc.2. Overview: This's a programmable digital countdown timer, ranging 0.1s - 999h. You can set 2 groups of time T1 and T2. With this timer, you can achieve following effect, a. You can let your instrument start to work or stop working after a specific time. Choose T1 / T2 =0. b. You can let your instrument work intervally. That's let it work for some time, then stop for another time, then start to work again... c. You can choose your instrument stop working for some time, then start to work for another time. After that, it'll stop and never start to work again. 3. Function list:P1--1: The relay switch on, after a delay of T1 time.P1--2: The relay switch off, after a delay of T1 time.P1--3: After a delay of T1 time, the relay switches on; then, the relay switches off after a delay of T2 time. Done.P1--4: After a delay of T1 time, the relay switches off; then, the relay switches on after a delay of T2 time. Done.P1--5: After a delay of T1 time, the relay switches on; then, the relay switches off after a delay of T2 time. The cycle will be repeated.P1--6: After a delay of T1 time, the relay switches off; then, the relay switches on after a delay of T2 time. The cycle will be repeated.4. Operation instructions:Set key: Hold it down for 2 seconds to enter the function settings. Press it to switch between function code and set parameter for them.Plus: Add TimeMinus: Minus TimeConfirm key: Start/Stop5. Use decimal point to set unit XX.X The decimal point is in tenth, time range: 0.1 second ~ 99.9 secondsXXX No decimal point, time range: 1 second ~ 999 secondsXXX. The decimal point is at the end, time range 1 minute ~ 999 minutes.XX.X. One decimal point is at the end, the other in tenth, time range 1 hour ~ 999 hours.6. Specification:Material: PCB + PlasticType: Time-Dalay RelayOutput Power: For Controlling DC/AC Load Within 5ATime Setting Range: 0s - 999hoursOptional Working Voltage(DC): 5V, 12V, 220VSize: 79 x 42 x 28mm(3.11 x 1.65 x 1.10in)Quantity: 1 Pc7. Note:Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you8. Package includes:1 x Time-Dalay Relay