Shure ULXD8 Digital Wireless Gooseneck Base Transmitter with No Mic Black (G50: 470 to 534 MHz)Key Features For ULX D and QLX D Digital Wireless Works with Shure Microflex Gooseneck Mic 1 10 20mW RF Output Power Configurable Mute Button with Status LED High Pass Filter Reduces Noise Secure AES 256 Encryption Networked Intelligent Charging 9 Hr with SB900A Rechargeable Battery The black Shure ULXD8 is a digital wireless base transmitter for Shure Microflex gooseneck microphones (available separately) and is compatible with ULX D and QLX D