System 20 Digital Wireless System includes ATW-R1440 4-channel receiver and two ATW-T1402 handheld microphone transmitters.Main Features:Digital 24-bit/48 kHz wireless operation for ultimate sound quality and dependable performancePlug-and-play operation in the 2.4 GHz range completely free from TV interferenceUser can switch between Standard mode (10 channels) and HD mode (20 channels) to minimize latency or maximize channel count, respectivelyReceiver units can be docked in the chassis or mounted remotely (up to 328 feet away) via Ethernet cable for added versatilityUp to five chassis can be linked and used simultaneouslyEach receiver channel can be paired with up to four transmitters, allowing users to instantly switch between different transmitter configurationsChassis System ID Display shows RF signal level, system ID, transmitter battery level, and system link statusEach half-rack receiver chassis comes with a short and a long rack ear, and two long ears can be combined as a joining plate to secure two chassis in a full rack spaceCompatible with Audio-Technicas Wireless Manager software for centralized management of system settings and operationsAuto-lock function prevents unintended operations like turning off the power or displaying the channel select screenSpecifications:Operating Frequencies: 2,402 to 2,480 MHzDynamic Range: 120 dB (A-weighted), typicalTotal Harmonic Distortion: < 0.05%, typicalMaximum Simultaneous Use (recommended):-Standard: 10 channels-HD mode: 20 channelsIt depends on the region and environment.System Frequency Response: 20 to 20,000 HzVaries depending on the microphone to be installed.