Frequency band : Default: 433MHz 410~441MHz channel:32, 4335MHz (recommended ) Connector : RS485:1 x 4 x 3.81mm Screwing, RS232:DB9 Standard DB9, hole Supply voltage : 8 ~ 28V DC Note: the voltage higher than 28V is forbidden Communication 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: 2.4kbps Transmitting power : Maximum 20dBm About 100mW, can be configured to 20, 17, 14, 10dBm Receiving sensitivity : -130dBm/2.4kbps Sensitivity has nothing to do with rate and timing Air data rate : 2.4kbps Can be configured to 0.3, 1.2, 2.4, 4.8, 9.6, 19.2kbps Standby current : 14mA Mode 3(power supply: 12V) Transmitting current : 126mA/20dBm 300mA (recommended) Receiving current : 28mA 12V Communication interface : RS232/RS485 8N1, 8E1, 8O1 Eight kinds of UART Rate, from 1200 to 115200 (default: 9600) Driving mode : RS232/RS485 Can be configured to -pull/high pull, open-drain Transmitting length: 512 bytes buffer 58 bytes per package Receiving length : 512 bytes buffer 58 bytes per package Address : 65536 configurable addresses Easy for network, and fixed transmission RSSI support : Built-in intelligent processing - Antenna type : SMA-K External thread hole Operating temperature : -40 ~ +85 Industrial grade Operating humidity : 10% ~ 90% Relative humidity, no condensation Storage temperature :-40 ~ +125 Industrial grade Colour:black Material:plastic Package 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.