The Shure ULXD2 is a handheld wireless transmitter compatible with ULX-D Digital Wireless Systems.The Shure ULXD2 is a handheld wireless transmitter compatible with ULX-D Digital Wireless Systems. With a rugged yet lightweight aluminum body and integrated antenna, the ULXD2 delivers uncompromising audio quality and RF performance, AES 256-bit encryption for secure transmission, and advanced rechargeability options for professional sound reinforcement applications.Main Features:30 Hz20 kHz range with flat frequency response (actual response is microphone dependent)Interchangeable Shure microphone cartridgesAES 256-bit encryption for applications for which secure transmission is neededProprietary Shure Gain Ranging optimizes the systems dynamic range for any input source, eliminating the need for transmitter gain adjustmentsShure Lithium-Ion rechargeable battery pack provides over 9 hours of battery life, precision metering in hours and minutes, and zero memory effectExternal charging contacts for docked charging (with the SBC200 Dual Docking Charger)Backlit LCD with easy to navigate menu and controlsRugged metal constructionFrequency and power lockout