Specification: Color: as shown in the picture Voltage: 12V Feature: This module uses MCU as the main chip. High timing accuracy MCU watchdog circuit and special reset chip. Fine workmanship and good performance. Stable and reliable work. Long lifetime. T1 (the relay on-delay time), T2 (the relay off-delay time) One-time mode (jumper OP3 1. The module is turned on when the relay is triggered, T1 delays and the relay is disconnected. 2. If it is triggered in the re-triggered deceleration process, it will immediately break the deceleration. Cycle mode (jumper OP4 1. The module power-on when triggered, the relay is switched on, delay T1, and the relay is disconnected, delay T2. The relay is switched on again. Such a cycle. T1 and T2 are each set by two adjustable resistors. 2. If it is triggered in the re-triggered deceleration process, it will immediately break the deceleration. Typical application reference 1. Timer operating equipment, such as each press key withdrawal when you reach 5 minutes auto power off. 2. Repeat the test circuits, e.g. B. for 1 minute, and then turn off such a test cycle for 1 minute. 3. Fish tank pump intermediate feed pump oxygen. 4. Other timing equipment. Performance: 1s-15min version: Jumper OP1: 1 to 100 seconds, 0.1 second control accuracy. Jumper OP2: 1 second to 15 minutes, 1 second control accuracy. The time lag error of all kinds of temperature and humidity is not more than 2%. Delivery content: 1 x Timer Relay ON OFF Cycle Module A notice: Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same.