Features: 1. Long distance wireless transmission (1200 bps in 1200 m / FU4 mode) 2. Operating frequency range: 433-458 MHz, up to 255 communication channels) 3. Maximum transmission power of 100 mW ( 20 dBm) and setting capacity of 8. 4. Four working modes to adapt to different applications 5. Integrated MCU, communication via serial port and external device 6. The number of bytes sent at a time is limited to 256 bytes. 7. The mode supports one to one, one to many, many to many connections Characteristic parameters: Model: GT-38 Chip: SI4438 Communication interface: UART level 3.3V to 5V TTL Operating voltage: 3.2V to 5.5 V Maximum transmission power: 20dBm Reference distance: 1200 meters Working frequency band: 433-458.5 MHz Antenna interface: spring antenna / antenna socket Current standby: no standby mode Module size: 26.7x12.9x6mm
