Kangnice 4-Channel DC 5V 9V 12V 24V Bluetooth Relay Module Wireless Remote Control Switch 4 channel relay.DTMF audio decoder control,Dial the number 1/2/3/4 control channel 1/2/3/4.Power anti-reverse diode. 8 kinds of Mode selection: Momentary, Toggle, Latch,Delay 5/20/60/120/250 seconds,Flexible wiringcan be controlled all kinds of electrical equipment: DC 12V LED Motor Forward and reverse,DC 1-48V /AC 85-265V LED Motor Electric light Refrigerator Air conditioning etc. Operating Voltage: DC 9-13V(Recommendation : 12V);Operating Temperature : -40-+85 C,Relay maximum load capacity: DC 0-48V/6A; AC 85-250V/5A, Use Method:This decoding module is for mobile and fixed telephone voice dialing decoding function , has 4 channels, 8 kinds of selectable output function,4 channels outputs decode mobile and fixed telephone keys (number1/2/3/4).or can be use "DTMF Dial" Software control.