Product description: This module uses a single-chip microcomputer as the main control core with high time precision. The built-in watchdog circuit and dedicated reset chip of the MCU work stably and reliably. [single mode] 1. Does not operate after power-on, the relay is turned on after the trigger, and disconnected after the arrival time. 2. During the delay after the relay is turned on, trigger again and the delay will be interrupted immediately. 3.0 to 15 minutes adjustable [Typical Application Reference] 1. Time-limited working equipment, for example, automatic power-off after 5 minutes of button triggering. 2. The machine repeats the test circuit, for example, a test that is energized for 1 minute and then powered off for 1 minute. 3. The aquarium water pump intermittently pumps water to pump oxygen. 4. Other time control equipment. 【Performance】 Jumper OP1: 1 second to 100 seconds, adjustment accuracy 0.1 second Jumper OP2: 1 second to 15 seconds, accuracy 1 second Delay error of no more than 2% under various temperatures and humidity Packing list: 1*Relay module This module uses a single-chip microcomputer as the main control core with high time precision. The built-in watchdog circuit and dedicated reset chip of the MCU work stably and reliably. [single mode] 1. Does not operate after power-on, the relay is turned on after the trigger, and disconnected after the arrival time. 2. During the delay after the relay is turned on, trigger again and the delay will be interrupted immediately. 3.0 to 15 minutes adjustable