The Shure ULXD2/SM86 Wireless Microphone operates within a frequency range of 20 Hz to 20 kHz, making it ideal for capturing a wide spectrum of sound. This handheld transmitter is compatible with ULX - D Digital Wireless Systems and features AES 256 - bit encryption for secure audio transmission. It incorporates Shure's proprietary Gain Ranging technology, which optimizes the system's dynamic range, eliminating the need for manual gain adjustments. The optional SB900A lithium - ion rechargeable battery pack offers over 12 hours of battery life, with precision metering and no memory effect. Additional features include external charging contacts for docked charging, a Transmitter Mute Mode for audio muting while maintaining RF channel presence, a backlit LCD for easy navigation, and rugged metal construction for durability. With frequency and power lockout capabilities, this microphone is perfect for professional audio applications.