UHF PLL 2*32 dual channels wireless amplifier teaching system Tone-lock,60-100meters Specifications:Frequency ... )S/N:>65dB (Mic 1,2) ; >75dB (Line) ; >105dB (Wireless Mic)T.H.D.:<0.5% (at 1KHz)Power Supply ... L)380mm*(H)75mm*(D)230mmFeature :1,with MP3 player (USB in ) 2, with 2 wired microphone input 3, with ... 5, with 2 *32 channels UHF PLL TONE-LOCK wireless microphone module 6,power out :30W×2 UHF PLL 2 ...