The HM-TRLR-D-TTL-433 is a 433.92 MHz transceiver module manufactured by Hope Microelectronics. It is a radio frequency (RF) module that supports frequency shift keying (FSK), Gaussian frequency-shift keying (GFSK), LoRa modulation, on-off keying (OOK), and TTL or universal asynchronous receiver-transmitter (UART) interfaces. The input voltage for this module is 3-3.6V, and the supply current is less than 25mA. It features a low power consumption and high sensitivity, as well as a frequency range of 433.05 - 434.79 MHz. This module is a great choice for applications such as remote control, data communication, and sensing systems.