4 Channel Relay Module SMS Call Controller GSM Remote Control Switch SIM800C STM32F103CBT6 for Greenhouse Oxygen Pump 5-12V FZ3327
Working frequency: GSM 850MHz, EGSM 900MHz, DCS 1800MHz and PCS 1900MHz.
Power supply interface: Power supply voltage: 5V-12V. When using 9V or less power supply, the current must be guaranteed 1.5A or above.
Relay interface: The output is the passive switch quantity. Using 250V 10A relay, the maximum power is 2500W, you can directly operate most of the electrical appliances on the market.
SIM Card Socket (Inside the shell): Insert micro SIM card when system powered off.
Switch quantity interface (Inside the shell: SIG): XH2.54-2P. When the two pins are connected, it will trigger the SMS alarm.
Keys: Press the keys can change the status of corresponding relay when controller is power on. Press key1 when device is power off, then power on, and press the button for 3 seconds, the controller will be back to factory setting. And the led indicators will show this status.
LED interface: There are 2 LED lights named work and err. LED indicators state corresponds to the equipment working conditions are as follows, each column is one state.
1 X 4 Channel Relay Module with Case