Azden APS-UR5 Plug-In UHF Receiver Module for APS 25 and 25b Speakers - Works with 15BT, 15HT and 15XT

The Azden APS-UR UHF Modular Plug-In Wireless Receiver is the UHF slot-in receiver option for the APS series portable powered speaker system. The receiver simply installs into the slot located on the rear of the speaker and provides 63 UHF channels of wireless microphone operation.