The ASK-4KIT-101 is a single zone audio monitoring system designed to interface with a DVR, VCR or other recording devices that accept line level input. The base station contains a built-in 3" speaker and volume control for producing live audio and audio playback. It also has a filter switch that enhances the quality of playback from 24-hour time-lapse recorders. With the kit is an omnidirectional, low impedance, electric condenser microphone with built-in preamp for producing line level audio. It is housed in a high impact ABS dome designed for ceiling or wall mounting. Normal pick-up pattern is approximately 15 ft from the microphone location, in all directions, or within a 30' diameter circle. This microphone is ideal for situations such as: Interrogation Rooms Booking Rooms Casino Soft Count Rooms Day Care Centers Police Interview Rooms Cashier Booths Convenience Stores Gas Stations Fast Food Restaurants Anywhere CCTV cameras are installed