This Shure BLX4R wireless receiver is perfect for musicians, sound engineers, and anyone who needs clear audio on stage or in the studio. It's a rack mount analog receiver that offers improved linearity and frequency response, with group and channel scan for easy setup. The receiver has a frequency range of 542-572 MHz and a bandwidth of 24 MHz. It can support up to 12 compatible systems per frequency band (region-dependent) and has a max operating range of 300' / 91.4 m (line of sight). The receiver has a rackmount size of 1 RU (1/2 rack) and comes with a rack mount kit. It weighs 35.2 oz / 998 g and has dimensions of 7.8 x 2 x 6.4' / 198 x 50 x 163 mm (without mounting hardware, antennas). The package weight is 6.4 lb and the box dimensions are 18.4 x 14.7 x 3.8'.