Digital conference system for discussion /audio conference system Sm612c/sm612d is a standard desktop microphone, simply operate, have auto/fifo mode, press the “application” button can make it start. Built-in dsp digital-processing chips can improve ability of sound processing. Excellent immunity to rf interference from mobile phones and rf devices. Chairman unit sm612c Delegate unit sm612d Main features: •pluggable gooseneck microphone with light ring •high sensitivity, effective pick-up range up to 50cm •support multiple chairman and vice-chairman at same time •speech patterns and apply itself is optional, common mode •not any impact on sound quality under long distance transmission •increased reliability with "closed loop - daisy chain" connection topology •system unit support hot plug function •highly resistant to mobile phone interference •chairman unit can override all the active delegate units and approve or reject delegates who request to speak Technical specifications: Pick up range: 0- 500mm Frequency response 40hz-19khz Sensitivity -42db±3db Snr -80db Nonlieardistortion