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Specifications: Operating voltage: power supply 1,DC 6.5-25V; power supply 2,DC 5V Operating Current(DC 12V): Standby current (all relays closed) 16MA, 1 relay open 50MA, 2 relays open 82MA, 3 relays open 115MA, 4 relays open 150MA Functional mode: each functional mode has 3 modes (not circulating, 2-99 cycles, forever circulating) Size: as the picture Weight:75g Settings: 1. After power , the remaining time of digital display channel (default channel 1). 2. Press "SET" button to enter "channel select" interface. In the "channel select" screen, then press "++"/"-" button to select channel to operate (relay). Press "OK" button will exit "channel select" screen, and save the current parameters. Press "SET" button into "parameter settings" interface. 3. under "parameters" screen press "SET" button you can switch parameters. "++"/"-" Button to modify the parameters. Press the "OK" button to exit the "parameters" screen, and save the current parameters.