Feature:1. Simple operation, most serial commands are singlebyte commands.2. With capacitor filter circuit, which has improved stability.3. Onboard 2 relay, which can be accessed extended 2way relay module.4. Twochannel relay, plus two expansion IO ports, lowlevel output.5. Built to meet standard specification, strictly follow factory quality control.Specification:Condition: 100% Brand NewItem Type: Relay Switch BoardMaterial: PlasticColor: As picture shownTwo-Channel Serial Relay:Channel: Two-channel relay, plus two expansion IO ports, low-level outputInterface: DB9 female/male RS232 level, can control the relay on, off, self-locking, inching through the super terminal (serial port debugging software) on the computer.Working Voltage: DC 12V power supply (range: 8.5-13.5V)Control Voltage: DC 9V 12V or DC 1-48V or AC 85-265VControl Current: 10A.Package List:1 x Relay Switch Board