1. Long-distance wireless transmission (up to 500m in open area, 10kbps air data rate). 2. Operating frequency range: 433–458.5 MHz, up to 255 communication channels. Maximum transmit power: 100mW (20dBm), with 10 adjustable power levels. 3. Built-in MCU; communicates with external devices via serial interface. Transmits up to 31 bytes per packet. 4. Supports point-to-point and point-to-multipoint transparent transmission via ID configuration. Serial port baud rate changes automatically synchronize with over-the-air data rate (10kbps–100kbps). 5. Features a three-minute configuration window after power-on during which the module can enter AT command mode by sending 'AT+ENABLE=1' for parameter settings. After this period, the module operates only in data transmission mode and all commands are treated as data. Product Name: VHF/UHF Radio Modem RS485 Wireless Transceiver 20dBm 433MHz Transmitter and Receiver 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 Area Transmission Distance: Up to 500m Dimensions (without antenna): 74 x 24 x 16mm Usage Instructions (requires 2 or more units): - For 2 units: Module 1 and Module 2 can send and receive data bidirectionally. - For 3 or more units: One unit acts as master, others as slaves. Operates similarly to wired RS485 bus. The master sends data to all slaves; any slave can transmit data to the master and other slaves. Only one device may transmit at a time to avoid collisions. Applications: IP PTZ Camera Modbus temperature sensor LED Controller RS485 Relay modules Remote control and remote monitoring systems Wireless meter reading Home automation Access control systems Smart metering Color: Blue Material: Plastic + Metal Package Contents: 2 x 433M-458M VHF/UHF Radio Modem RS485 Transceiver (with enclosure) Note: Other accessories not included. Note: Lighting and display differences may cause slight variations in color representation. Measurement tolerance: ±1–3cm.