The CLS 100 visitor enclosure unit CLS100 is a part of the security system allowing speech through security windows and screens. The CLS100 Visitors unit is constructed from steel and has full Duplex two way communication with the CLS100 Staff unit. The steel constructed Visitor CLS100 unit is a Surface mount loudspeaker that can be fixed on a wall or counter top. Elliptical paper cone loudspeaker loudspeaker (90 x 50mm), Frequency response 180 – 16 KHz, 5 Watts, SPL 85dB. Must be used in conjunction with the amplifier unit CA100, and visitor microphone CML100 and CLS100 Staff unit.