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Digital 4 Button Delay Timer Relay 6-30V Cycle Delay Timer Switch is a timer relay suitable for your Egg incubator and other time-related Devices. The timer relay module is a Digital display Led Home Automation Delay Timer Control Switch Module Timer Controller, Operating voltage: 6-30V, support micro USB 5.0V power supply, Output capability: Can control the device within DC 30V 5A or AC 220V 5A. This best incubator timer controller can be applied to many fields; there is a wide range of applications. Programmable Triggered Timing Circuit board Hw-521 35238mp.