The CMT2157B-ESR is a radio frequency (RF) transmitter integrated with an integrated circuit by Hope Microelectronics. The 3-wire SPI transmitter is packaged in an SOP14 form factor and provides up to 13dBm output power. It is designed for use in consumer, remote control, automotive, industrial, and integrated communication systems. The CMT2157B-ESR features low power consumption, low operating voltage, and wide bandwidth capabilities. It is also RoHS compliant and can operate at a temperature range of -40 °C to +85 °C.