Feature:1. With two serial ports, RS232 DB9 interface and TTL232 interface2. With AT instruction and 8-byte instruction, the two instructions are automatically recognized, no need to switch3. 6 working modes, open, close, jog, self-lock, interlock, delay (8-byte instruction without delay mode)4. Maximum delay of 9999 seconds under AT command5. Adopted of high quality electronic components, and accuracy process, ensure for the durabilitySpecification:Item Type: RS232 Delay Relay ModuleWorking Voltage: DC 12VWorking Current (DC 12V): Standby 16MA, 1 relay opens 47MATwo Types of Instructions: AT and 8-byte instructions. The two types of instructions are automatically recognized without switching.Two Serial Ports: RS232 DB9 interface, TTL 232 interface6 Working Modes: Open, close, jog, self-lock, interlock, and delay (8-byte instruction without delay)Maximum delay of 9999 seconds under AT commandSize: Approx. 56.5 x 31.5 x 17.5mm / 2.2 x 1.2 x 0.7inMaximum Load: 10A / 250VAC, 10A / 125VAC, 10A / 30VDC, 10A / 28VDC, 10A / 12VDC.Package List:1 x RS232 Delay Relay Module