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The one group consists of one master terminal and maximum 9 slave terminals ● Master : Communication function between radio and slave (Including external radio) ● Slave : Intercom function and communication function with external radio by master terminal   SPECIFICATIONS Item Specification Radio Frequency Type ISM 2402MHz ~ 2480MHz Radio Interface ISM 2.4GHz: FSK Modulation with Frequency Hopping Output Power: Class 1(100mW) Tx Max Output Power 100mW Rx Sensitivity -95dBm Voice Latency < 100ms Line Station Connector XLR-4S and 3.5pi Ear-Jack and mini USB Headset Station Connector XLR-4P and 3.5pi Ear-Jack and mini USB Battery Internal Li-Polymer @3.7V/2200mA Antenna Internal Chip Antenna @Avg. -2dBi Audio Sampling Frequency 8KHz Microphone Type Electret or Dynamic Charging Via mini USB connector using supplied Charger Noise Reduction 100dB with soundproof Channel Setting Selected by Group ID through LCD (LOS) 100 ~ 200M @Class 1 Maximum operation users 9 person ( Not include Master device ) Dimensions 111.5mm(H) x 69mm(W) x 30mm(D) Weight < 220g