EIKON J&H Wireless Headset system The EKJ&H is a quartz-controlled UHF headset wireless microphone system that provides reliable, high-quality signal transmission. The EKJ&H comes with 3 units: the EKJ&H headset transmitter, the EKJ&H compact "connector-style" receiver, and a USB to USB-C charging cable. 50 frequency channels are available in 512 - 541 MHz, allowing the system to be used with other wireless equipment simultaneously. UHF 512 - 541 MHz frequency band Quartz locked modulation mode Up to 20 meters range Built in 3.7V/500mA lithium battery 5V USB-C charging cable included Up to 4 hours autonomy Up to 6 systems usable in the same location Download Manual HERE TECHNICAL SPECIFICATIONS EKJ&H – UHF PLL Headset Transmitter RF Channels 50 frequency presets RF Frequency Band UHF: 512 - 541 MHz RF Frequency Stability ±0,002% RF Oscillation Mode Quartz locked RF Modulation Type Wideband FM Stereo RF Output Power 10mW Sub-harmonic < 40 dB Operating current 130 mA Operating Time 3 to 5 hrs (depending on use conditions) Operating Power Supply 3.7 V / 500 mA - built-in Lithium battery Charging mode USB charging 5V – type USB-C connector Charging time 4 hours Weight 0.50 Kg EKJ&H –UHF PLL Receiver RF Channels 50 frequency presets RF Frequency Band UHF: 512 - 541 MHz RF Frequency Stability ±0,005% RF Oscillation Mode Quartz locked RF Modulation Type Wideband FM Stereo RF Receiving Sensitivity < -95 dBm RF Receiving range 20 meters depending on used band conditions Audio dynamic range 106 dBm THD Distortion < 0.5% S/N Ratio > 90 dBA Audio output connector 6.3 mm Mono Jack Output Power Max (continuous) 400 mW Operating current 80 mA Operating Time 5 hours Operating Power Supply 3.7 V / 500 mA - built-in Lithium battery Charging mode USB charging 5V – type USB mini connector Charging time 3 hours Weight 0.05 Kg