The E840-TTL-NB03 with Communication Modules RoHS is an electronic part manufactured by Ebyte. It is a type of transceiver module with communication modules built in, which is RoHS compliant. It is designed for use in Industrial Internet of Things (IIoT) applications such as data collection, telemetry and control. This module has a TTL interface and can be used with a range of different cables, depending on the application. The module also features an aluminum shielding case, a low-power consumption design, and an operating temperature range of -40°C to +85°C. Moreover, it supports a wide supply voltage range of 3.3V to 5.5V for reliable operation.