Shure QLXD24/SM58 Wireless Digital with SM58 Capsul

20 Hz to 20 kHz frequency range with flat response (actual response is microphone dependent) - Interchangeable Shure microphone capsules, including the legendary SM58 - AES 256-bit encryption for secure transmission - Over 120 dB of dynamic range – no transmitter gain adjustment needed - 1, 10 mW selectable RF output power - Up to 9 hours continuous use with 2 x AA alkaline batteries - Optional Shure lithium ion rechargeable battery provides up to 10 hours of continuous use and reports remaining runtime in hours and minutes - External charging contacts for docked charging - Backlit LCD with easy to navigate menu and controls - Selectable display mode showing group/channel, frequency, or battery runtime - 100 meter (330 ft.) line-of-sight operating range - Rugged metal construction - Frequency and power lockout