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On-board loaded 8bit high performance MCU and spp-c bluetooth 2.1 slave module Distance control : 10M (without obstacle ) Working voltage : DC12V With bluetooth status indicator and relay indicator On board 2 way 12V,10A/250V AC 10A/30V DC relay, can be used continuously for 100 thousand times, with diode discharge protection within short time. Reserved UART debugging interface and MCU program download port.Board size :40*64.5mm