Features:
DC 12V powersupply (voltage range 9-13V ).
Standby current(all relays closed) 11-13MA, 1 relay open 44MA, 2 relays open 77MA, 3 relaysopen 110MA,4 relays open 140MA.
"Open""close" "Momentary""Self-locking" "Interlock" "Delay" 6 Commands.
Twoinstruction-control mode 
Under the ATcommand ,the maximum delay is 9999 seconds.
AT commands can bemade serial Hyper Terminal (serial assistant) Enter;
Under the command mode, it can support up to 32 devices in parallel.

Specifications:
Size: as the picture
Weight: 59g
Maximum load:10A / 12VDC

Glossary:
NO        : Relay normally open contact
COM      : Relay common contact
NC        : Relay normally closed contact
Open      :NO connection COM, NC disconnect COM
Close      :NO disconnect COM, NC connection COM
Momentary : Enter theMomentary command, the receiver Relay is Open, delay of 0.5 seconds after, Relayis Close;
Toggle : Enter the Toggle command, the receiver Relayis Open, Enter the Toggle command again, Relay is Close;

Latched : Enter the Channel1 Latched command, the receiver Channel 1 is Open, the Channel 2 is Close.
Enter the Channel 2 Latchedcommand the receiver Channel 2 is Open, the Channel 1 is Close.
Enter the Channel 3 Latchedcommand the receiver Channel 1 is Close, the Channel 2 is Close.

Delay : Enter the Delaycommand, the receiver Relay is Open, delay of 0-9999 seconds ,after, Relay is Close;
During the delay, Eterthe Close command, immediately close the relay

Command mode selection :( figure above) A5to the ON side is command mode. End to the OFF (non ON side) is ATcommand mode.

Slave ID: A0-A4 is the slave ID, you canchoose 32 different slave ID.
Under the command mode,the slave IDmust be correct

Typicalapplications:
1AT command mode (A5 = OFF), in this mode can bethrough the serial Hyper Terminal (serial assistant) enter a simple AT commandcontrol relay. AT command mode time up to 9999 seconds

2  command mode (A5 = ON), you can control a variety of ways: Serial Hyper Terminal Control (need to manually add the CRC), Poll software control (software automatically add the CRC), PLC or MCU process control

Wiring Diagram:

1 DC 12V control circuit,Wiring diagrambelow. "LOAD" may be camera,LED lights, fans, motors and other DC 12Vequipment

Package Included:
1 x Delay Timer Switch Relay