Featuring an integrated BETA 58A® microphone cartridge, the BLX2/B58 Handheld Wireless Microphone Transmitter delivers wireless audio with professional clarity and reliability. Works with BLX® Wireless SystemsOffers up to 14 hours of continuous battery life with 2 AA batteriesAllows for custom handle design at designstudio.shure.comIncludes BLX2/B58, microphone clip, 2 AA batteries, and user guide The BLX2/B58 Handheld Wireless Microphone Transmitter works with BLX Wireless Systems  Features Integrated microphone capsule design Lightweight, rugged construction -10 dB gain attenuation Color ID caps (available separately)   Warranty: 2 years.