The HM-TRLR-D-TTL-868 by Hope Microelectronics is a transceiver module designed for radio frequency communication at 868MHz. It supports frequency shift keying (FSK), Gaussian frequency shift keying (GFSK), LoRa, and on-off keying (OOK) modulation techniques. With dual interface TTL and UART it is easy to connect the device to a range of microcontroller, IC, or system interfaces. The device supports AES-128 encryption for secure communication applications, as well as high-speed communication and full packet transmission. It also features a low standby current, high sensitivity, and a wide operating voltage range.