Professional Dual Handheld VHF Wireless Microphone System Cordless Karaoke Microphone Speaker with Battery for KTV Party

Features Using vhf 200 280 Mhz band to avert interferencing frequency Using multilevel high frequency and mid frequency narrowband filter so as to dispel anypossible interferencing signals The wireless microphone use hidden antenna look good and are useful There is a volt indicating circuit in the the microphone it can tell you if it is necessary tochange the battery Specially designed circuit switch is on the phone it is for clearing up waves of miscella neous siona All use quartz crystal oscillating circuits so the frequency is very steady This kind professional wirele ss microphone adopt a series of measures to improve its functions advance frequency Using multilevel high frequency and mid frequency narrowband filter mulriple no e detect and control Designing it special functions tone key locked identity to a void interference from outside Effective built in spherical wind Specification Carrier frequency VHF 280MHZFrequency stabilization less than30ppmDynamic range more than 90dbTotal harmonic distortion less than 0 5 Frequency response 40hz 15khz 3dBAudio output level separate type 0 400mv mix tune 0 200mvEffective distance received empty place 40 50 meters at the farthestFixed receiverPower supply AC110 220v45 60hzConsume power 4wattSignal noie power more than 90dbSignal nose ratio more than 80dbImage spurious reiection more than 80dbReceivering sensitvity less than 10dbuv sinad 30db De emphasis 50usHanding microphoneTransmitter power 30mwModulaton type FM F3