3DR Radio Telemetry Kit, 433 MHz, 500 mW/100 mW Radio Telemetry, 433 MHz and 915 MHz Air and Ground Data Transmit Module for APM 2.6 and 2.8 Pixhawk Flight Control

433 MHz frequency channel, transparent serial interface, data rate up to 250 kbps, antenna range about 1 mile.
Adaptive time-division multiplexing
433 MHz frequency channel, transparent serial interface, data rate up to 250 kbps, antenna range about 1 mile.
Adaptive time-division multiplexing