B-Stock, AKG WMS 40 Mini Earmic ISM2, UHF Wireless-System with bodypack transmitter and Earset COBT, non Diversity receiver with adjustable balanced jack output, HDAP Technoloiy(High Definition Audio Performance), up to 30 hours with one 1x AA Battery, LED status control on transmitter, Low Battery control on transmitter, On/Off/Mute switch on transmitter, three status LEDs on receiver, incl. condenser Earmic microphone COBT, frequency ISM 2 864,375 MHz. No licence needed, free to use all over Europe., B-Stock with full warranty, may have slight traces of use