Line6 Relay XD-V55HS - 2.4 GHz Headset wireless system with EQ Settings,desk receiver, pocket transmitter with condenser headset microphone, omni-directional, 3 EQ Filters, 12 switchable frequencies (all 12 work parallel), 10 - 20.000 Hz audio frequency range, >117dB dynamic range, up to 90m range (depends on location), DCL (Digital Channel Lock), low latency < 3,5 ms, approx 8hr battery life, XLR and Jack output, world wide licence-free use.