Long-distance wireless transmission up to 500 meters in open areas with a 10kbps air baud rate. Operating frequency range of 433-458.5MHz with up to 255 communication channels. Maximum 100mW (20dBm) transmit power with 10 adjustable levels. Built-in MCU uses serial port communication with external devices, sending 31 bytes at a time. Supports one-to-one and one-to-many transparent transmission communication through ID setting. Changing the serial port baud rate synchronously changes the air data rate (10kbps-100kbps). Features a three-minute initialization period for parameter configuration via AT commands. Product Name: VHF/UHF Radio Modem RS485 Wireless Transceiver Working Voltage: 4.5V-5.5V Interface: RS485 (5V GND A+ B-) Frequency: 433MHz Transmit Power: -40 to +20dBm Receiver Sensitivity: -114dBm Operating Temperature: -25°C to +75°C Transparent Transmission Baud Rates: 1200, 2400, 4800, 9600 (Default), 19200 Open Ground Transmission Distance: 500M Size (Without Antenna): 74 x 24 x 16mm Recommended to purchase multiple units for network configurations. With two units, modules send data to each other. With three or more units, one operates as a master device while others function as slaves, working similarly to a wired RS485 bus system. Applications: IP PTZ Cameras, Modbus Temperature Sensors, LED Controllers, RS485 Relays, Remote Control Systems, Wireless Meters, Smart Home Automation, Access Control Systems, Smart Meters. Color: Blue Material: Plastic and Metal Package Contents: 2 x 433M-458M VHF/UHF Radio Modem RS485 Transceivers (With Housing). Only the specified items are included.