Bidirectional Modules are mainly designed for the ISM band.
Modules
Modulation
Frequency
Working Voltage(V)
Working Current(mA)
TX Power(dBm)
Sensitivity(dBm)
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SM1139
GFSK
425~525
2.2-3.6
77@TX；3.8@RX
20
-114
SM1040
FSK
300~400
2.3-5.0
24@TX; 5@Rx
13
-106