【Effective Control】: This ON/OFF cycle time relay board module with LED display is great to control the reciprocating stroke, or repetitive power on and off for equipment and products burn-in test 【Product Characterization】: This adjustable cycle delay timer relay switch module is a timer relay module with high precision, which has stable and performance, so you can trust and use it with confidence 【Wide Field of Applications】: Our DC 12V infinite loop time relay board is widely used on timer operating equipment, machine repetitive test circuit, fish tank intermittent pump, etc, which can satisfy the basic needs of users 【Wide Range】: There is a wide time range that users can set, both "on" time and "off" time are adjustable, so if users want to adjust the different time, it is efficient for users to set in a wide range 【Working Principle of Product】: Our high precision timer relay module can connect for a period of time, and disconnect for a period of time, which supports infinite loop, and it also supports memory when power failure