1PRODUCT DISPLAY2LOCK FUNGTION3MULTISET PERPORMANGE4ANTI-INTERFERENCE5VARIOUS CONNECTIONS Frequency range 538.3 - 599.5 MHzNumber of adjustable channels4 * 100UHF Adjustable Frequency Receive sensitivity-105dBSignal-to-noise ratio>95dBFrequency stability 0.002PPMH armonic distortion< 0.5 %Power supply: 8 * 1.5V (AA) (the package does not include batteries) Battery life16hDistance290ft 328ft line of sightlock FunctionLong press the SET button (2s) to lock your settngs Home karaoke setup1How to set up auto scan1. Press the SYNC button to startautomatic scanning and wait forthe new frequency to appear 2. Align the transmitters infraredwindow vertically with the receiverinfrared window for pairingMaterialaluminum alloy