Welcome to the store! Working Voltage: 4.5V-5.5V; Interface: RS485 Frequency: 433MHz Transmission Power: -40~+20dBm; Receiver Sensitivity: -114dBm; Operating Temperature: -25~+75; Transparent Transmission Mode Baud Rate: 1200 2400,4800,9600(Default),19200; AT Mode Configured Baud Rate Fix is: 9600BPS; Open Field Transmission Distance: 500M; Size (without antenna): 58.5x30x13.8mm; Weight (without antenna):16.8g How to Use (Equal to 2pcs): 1: 2PCS, Module 1 and Module 2 send data to each other. 2: 3PCS, Module 1 sends data, module 2 acts as a repeater (multiple repeaters can be used), and module 3 receives data; delay of transmission and receiving distance. 3: Equal to 3PCS, one as the master unit, the other as the slave unit. The way they work is similar to a wired RS485 bus. The master unit sends data, the slave units receive all data. Any slave unit sends data, the master unit and the other slave units can receive. At any time, only one device (master or slave) is allowed to transmit data. Application PTZ Camera Modbus Modbus Temperature Sensor LED Controller RS485 Relay Remote Control, Remote Measurement System; Wireless Meter; Smart Home, Home Automation, Smarter Home; Access Control; Identification System; Data Acquisition; IT Home Appliance; Intelligence Home Appliance; Baby Monitor System; 433M Suction Cup Antenna: Applicable Frequency: 315MHz/433MHz/470MHz Gain: 5.0 dBi S.W.R. Less than 1.5; Input Impedance: 50ohm Antenna Length: 145mm Cable Type: RG174 Connector Type: SMA Connector Straight Cable Length: 1.5M Color: green Material: PCB+Plastic+Metal Package Contents: 1 x Multifunctional Wireless RS485 Transceiver 1 x Antenna Only the above package content, other products are not included. Note: Light reflections and different displays may cause the color of the item in the picture to be slightly different from the actual item. The allowed measurement error is +/- 1-3cm. Your satisfaction is our top priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will provide you with the best solution!