up to 30 ours with one 1x AA Battery, Low Battery control on transmitter, HDAP Technoloiy(High Definition Audio Performance), non Diversity receiver with adjustable balanced jack output, On/Off/Mute switch on transmitter, three status LEDs on receiver, frequency ISM 1 863,100 MHz, UHF Wireless-System with dynamic handheld transmitter, LED status control on transmitter, free to use all over Europe