1. and high quality. 2. Small body and stable performance. 3. This module is programmable and can realize thousands of functions. 4. Work performance is stable and reliable 5. Built-in timing circuit can effectively long-term operation of the module 1. Turn on the power, the relay 1 is closed after N seconds of closing; then the relay 2 is closed after N seconds of closing. 2. Turn on the power, the relay 1 is turned off after N seconds of closing; then the relay 2 is turned off after N seconds, and then cycles. 3. When the power is turned on, the relays 1 and 2 are not activated. When there is a signal or a button is triggered, the relay 1 is turned off after N seconds is closed; then the relay 2 is turned off after N seconds and then turned off until trigger, repeating the same action. By programming the signals 1, 2, any control of the relays 1 and 2 can be achieved. 4. When signal 1 has a signal, relay 1 is closed and relay 2 is turned off; 5. When signal 2 has a signal, relay 1 is turned off and relay 2 is closed. 6. Only the NPN sensor signal can be connected, and the sensor signal can be programmed to realize any control of the relay. 7. When signal 1 has a trigger, control relay 1; when signal 2 has a trigger, control relay 2. 8. Turn on the power, control the motor to rotate for N seconds, then reverse N seconds, and cycle. 9. When the signal 1 has a signal, the motor is controlled to rotate forward; when the signal 2 has a signal, the motor is reversed. Material:Plastic + metal colour:black Package Contents: 2 x Relay Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.