Communication distance by default: approximately 600 m (the communication distance is adjustable up to 1000 m, baud rate of 5000 BPS). Operating frequency range: 433.4-473.0 MHz Supply voltage: 3.2 V - 5.5 V. (If the modules operate for a long time in the emission state, it is suggested that when the voltage power supply is greater than 4.5 V, you must concatenate a 1 N 4007 diode to avoid the LDOs integrated into the module. I have fever) Default inactivity current: 16 MA (modules in different operating mode and running differently). Mini size, only 27.8mm * 14.4mm * 4mm.
