Frequency band : Default: 433MHz 410~441MHzchannel:32, 4335MHz (recommended )Connector : RS485:1 x 4 x 3.81mm Screwing, RS232:DB9 Standard DB9, holeSupply voltage : 8 ~ 28V DC Note: the voltage higher than 28V is forbiddenCommunication level : RS232/RS485 Available for RS232 and RS485. Operation range : 3000m Test condition: clear and open area & 20dBm, antenna gain: 5dBi, height: 2m, air data rate: 2.4kbpsTransmitting power : Maximum 20dBm About 100mW, can be configured to 20, 17, 14, 10dBmReceiving sensitivity : -130dBm/2.4kbps Sensitivity has nothing to do with rate and timingAir data rate : 2.4kbps Can be configured to 0.3, 1.2, 2.4, 4.8, 9.6, 19.2kbpsStandby current : 14mA Mode 3(power supply: 12V)Transmitting current : 126mA/20dBm 300mA (recommended)Receiving current : 28mA 12VCommunication interface : RS232/RS485 8N1, 8E1, 8O1Eight kinds of UART Rate, from 1200 to 115200 (default: 9600)Driving mode : RS232/RS485 Can be configured to -pull/high pull, open-drainTransmitting length: 512 bytes buffer 58 bytes per packageReceiving length : 512 bytes buffer 58 bytes per packageAddress : 65536 configurable addresses Easy for network, and fixed transmissionRSSI support : Built-in intelligent processing -Antenna type : SMA-K External thread holeOperating temperature : -40 ~ +85 Industrial gradeOperating humidity : 10% ~ 90% Relative humidity, no condensationStorage temperature :-40 ~ +125 Industrial gradeColour:blackMaterial:plasticPackage Contents:1 x Receiver(Due to different product batches, the appearance may be different, the functions are the same)Only the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real . The measurement allowed is +/- 1-3cm.