Overview
Shure QLXD2/K9 Handheld Transmitter with KSM9HS Microphone
Shure is a good choice to get the job done. Featuring transparent 24-bit digital audio quality, it is used for wireless vocals in presentation spaces, music venues, houses of worship, DJ setups, and more. It features a 20Hz to 20kHz frequency response and has more than 60 available channels per frequency band. Powered by 2 AA batteries, the QLXD2 quickly syncs with a wireless receiver over IR at the push of a button and maintains clear, uninterrupted signal over its entire 100 m (328 ft.) range. 
Features

Features interchangeable Shure microphone capsules
AES 256-bit encryption for secure transmission
Up to 9 hours continuous use with 2 x AA alkaline batteries
Optional Shure SB900 lithium ion rechargeable battery (sold separately) provides up to 10 hours of continuous use and reports remaining runtime in hours and minutes
Backlit LCD with easy to navigate menu and controls
Selectable display mode showing group/channel, frequency, or battery runtime
Rugged metal construction
Transmitter has 328' (100 meter) line-of-sight operating range