Feature:1. 16-channel relay module, multi-channel control.2. RS232 DB9 female interface, convenient and practical.3. Open, close, jog, self-lock, interlock, delay, all open, all close 8 working modes (8-byte instruction no delay mode).4. AT command and 8-byte command. The two commands are automatically recognized without switching. The maximum delay under the AT command is 9999 seconds.5. Maximum Load: 10A / 250VAC, 10A / 125VAC, 10A / 30VDC, 10A / 28VDC, 10A / 12VDCSpecification:Item Type: 16-Channel Relay BoardPower Supply: DC 12V power supply (voltage range 9-13V)Standby Current: 18MAInterface: RS232 DB9 female interface8 Working Modes (8-byte Instruction Without Delay Mode): Open, close, jog, self-lock, interlock, delay, all open, all closeTwo Types Of Instructions: AT and 8-byte instructions. The two types of instructions are automatically recognized without switching.Maximum delay under AT command is 9999 secondsSize: Approx. 172 x 65 x 19mm / 6.8 x 2.6 x 0.7inWeight: 228 g / 8 oz(approx.)Maximum Load: 10A / 250VAC, 10A / 125VAC, 10A / 30VDC, 10A / 28VDC, 10A / 12VDC.Package List:1 x 16-Channel Relay Board