Four-channel serial relay: 1. DC 12V power supply (voltage range 9-13V) 2. Standby current (all relays closed) 18MA, 1-way relay "open" 50MA, 2-way relay "open" 81MA, 3-way relay "open" 110MA, 4-way relay "open" 141MA 3. RS232 DB9 female interface 4. Read, open, close, self-lock, jog, interlock 6 instructions, can meet most industrial control occasions 5. Relay load voltage: DC 1-100V or AC85-265V 6. Relay load current: maximum 10A 7. Weight: 62g 8. Size: 90mmx47mmx19mm Colour:As Shown Material:PCB Due to different batches, there may be differences in product appearance and printed text, which not affect use Package Contents: 1 * RS232 relay Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.