The EnOcean 4 Click Board™ carries an ultra-low-power TCM515U transceiver gateway module that operates at 902MHz radio band, perfectly suited for the realization of transceiver gateways, actuators and controllers for systems communicating based on the EnOcean radio standard. For communication to other devices, we have implemented a PCB antenna on the board making this Click Board™ ready to use device which can filter, decrypt and authenticate traffic before forwarding it to the processor or PC over UART.