Window speaker system provides two way sound; without hollow sounding or static noise; more stable signal; no sound cut in and out problems;Suitable for drive thru store; clearly hear the customer sounds with double way signal transmission; you can paste the outside metal outside speaker on the glass with double side adhesive tape; easy to use;2 way sound;Auto dual way intercommunication without pressing any button; the communication voice can be clear from different directions;no need to worry about sound cuts in and out problem;High sensitive microphone;-48db value; the voice is more realistic and clear; you can pick up voice with no break up;High power output;high output power for main sound and sub sound; customers does not need to get right close to it for it to work correctly; no audible hiss from the receptionist speaker;Feedback sound reduction;Microcomputer processing circuit can solve the problem of echo and squeal; avoid feedback sound or hollow sounding problems; you can acquire more stable signal without static or high pitch;Aluminum alloy shell;More durable use compared with fragile plastic type; it can resist erosion for durable use; it also adopts a 4 core high strength aluminum foil shielded wire; more stronger connection plug;Volume adjustment;The volume and microphone sensitivity can be separately adjusted for inside microphone and outside speaker; easy operation; just roll the volume button; you can also mute the sound by press the I-shut and O-shut button;Recording function;You could plug external recording voice through record jack; it can output two way signals both inside and outside; work well for any place which difficult to talk; such as bank; securities; hospital; bus station etc;Package Includes:;1 x Dual-way counter main station;1 x External speaker;1 x Power adapter;1 x English manual