Shure SLXD24D+E/Beta58 K55 - Digital 2-channel UHF wireless system; consisting of an SLXD4+ dual receiver and two handheld transmitters with dynamic Beta58A microphone capsule; Polar pattern: supercardioid; frequency response: 20 - 20,000 Hz; transmission range: 606-694 MHz; audio transmission: 24 bit/48 kHz; dynamic range: >118 dB; switching bandwidth: 138 MHz; switchable transmit power: 1 mW/ 10 mW/ 30mW; 14 compatible channels per 8 MHz band, 11 compatible channels per 6 MHz band; automated setup and pairing; ShowLink® Ease enables remote control and management of transmission parameters for paired devices; integrated Shure Digital Feedback Reducer software; XLR/jack output; AES-256 encryption; transmitter operation with 1.5V AA batteries (up to 8 hours of operation), optionally also with SB903 Li-ion battery (not included); Weight: 930 g (receiver), 144 g (handheld transmitter); includes 19" mounting accessories, microphone clips, power supply, 1/4 lambda antennas, carrying bags and AA batteries