Red LED Power ON Indication on Master Unit. Rotary Volume Control for Substation Unit. Substation Powered by Master Unit. Substation Microphone is Fully Hands-Free. Supplied with 4 x Cable Fixing Bases and Cable TiesPower Supply: 12Vdc Mic Lead Length: 1.6m Gooseneck Length: 138mm Dimensions: 95 x 130 x 50mm (Main Unit) & 78 x 20 x 95mm (External Mic) Weight: 0.58Kg. The eagle 2 way talk through glass intercom is ideal for use in shops- security lodges- receptions- post offices- petrol stations and banks; in fact anywhere that conversation needs to take place but communication is difficult because of security / health screens. The intercom is fully automatic- hands-free and two-way- with a desk mount base station and condenser goose-neck microphone on the main unit. The main unit has a high quality speaker and the volume on both the inside and outside speaker can be adjusted. The unit has a special microcomputer voice processing circuit to help solve the problem of echo and feedback and adjustable internal and external mic volume controls- the unit has been designed for long term use. Supplied with a plug in 12v power supply.. intercom-audio intercom-microphone intercom