Supply voltage: 3.2V~5.5V. (If the module you want to work long hours in the emission state, it is recommended that when the supply voltage exceeds 4.5V threaded a 1N4007 diode to prevent module built-in LDO heated)Default address range (open field test): About 600m (maximum communication distance adjustable reach 1000m, the baud rate is 5000bps)Default idle current: 16MA (In different working