... Microphone,Omni Directional, Monitor Range 10-40sq.m,suitable for jail room ,meeting room, visitation room,classroom Flat Style ... 95mm*95mm*30mm, Weight 80g, sky-blue Case. suitable for jail room ,meeting room, visitation room,classroom etc small ... low noise.*Restraining high intensity voice automatically, protecting rear devices* suitable for jail room ,meeting room, visitation room,classroom etc ...