As sensor technology becomes more pervasive in our daily lives, an issue which arises is how to efficiently deal with the large volume of data created by these sensors. Typically, a sensor is capable of capturing far more information than is necessary for use in any given application. However, different types and amounts of data may be needed for different applications and different levels of accuracy at different times. Therefore, it is desirable that sensors are able to continue to collect comprehensive amounts of data and to send it to a unit which is able to optimize the data storage and transmission in order to reduce both upstream and downstream burdens caused by large sensor data volumes. Disclosed herein are several examples of communications devices. Communications devices can be modular, as shown, and/or stackable, as shown. An advantage to modular/stackable systems is that they can be easily customized to specific demands.