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TTL Serial Port 4-Channel Relay Module Control Board for Arduino ARM PIC AVR DSP
Features:
- 5V to 3.3V conversion circuit.
- Over current protection
- 4 channel 250V 10A relays with LED indicator.
- Support cascade ( one module for 4 channel, two module connected together into 8 channel, and so on, up to 24 channel ).
- 3.3V voltage output.
- Bluetooth wireless serial or RF wireless serial ( optional ).