The Skyport Transceiver RX module fits only Elinchrom RX units using the integrated multiple interface for triggering and for the computer remote operating option. No internal battery is required, just plug into a Style RX, Ranger RX or Digital RX flash unit (Please remember to double check the “Group” and “Channel Frequency” settings) and the Transceiver RX is ready to use. To control the flash power, modeling lamp and flash synchronization, only the Transmitter (sold separately) is required. To control all RX functions, the latest EL-Skyport software and USB Transceiver RX (both sold separately) is required.NOTE! To connect the Skyport Transceiver RX module to the Charge/Remote socket of the Ranger RX battery pack, the Remote Adapter 19374 or Remote Adapter Cable 11110 is required.