Headset wireless system from GLX-D Advanced series that operates in the Z2 frequency band and includes the GLXD1 body-pack transmitter, GLXD4R rack-mountable receiver, SB902 spare/replacement lithium-ion battery and SM31FH fitness headset microphone plus necessary accessories such as rechargeable battery, power supply, USB cable and carrying case. The rack-mountable wireless receiver GLXD4R with removable antennas features the revolutionary LINKFREQ Automatic Frequency Management and allows for operation of up to 4 compatible systems in a typical setting, and up to 8 maximum under ideal conditions. Its integrated battery charge port can charge a spare battery while the system is in use. The receiver features a high resolution LCD screen for real-time transmitter battery status, remote adjustable transmitter gain control and two-colour charge indicator LED, as well as XLR and 6.3mm output connectors. The GLXD1 transmitter features an ergonomic design and reversible belt clip to fit comfortably and snugly in various positions. It offers up to 16 hours of continuous use with Shure lithium-ion rechargeable batteries and provides locking TQG connection for use with Shure lavalier, headset, earset, and instrument microphones and guitar cables. The SM31FH headset condenser microphone is perfect for use in fitness instruction and features hydrophobic construction that repels moisture and resists corrosion. Its flexible gooseneck provides discrete adjustment capabilities to optimize placement for greatest isolation and lightweight and low-profile design will not fatigue user during high-impact use. Included windscreen tames plosive, breath, and wind noise for clean and intelligible sound. Frequency: 2,4 GHz