These units are NEW in box with all accessories including mic and labels. Speaker not included. 
Description from SoundOff Signal: 
Sound intensity and amplification to increase coverage on the scene
Choose between button or knob control and 100 or 200-watt options
200-watt sirens feature dual-tone capability to deliver two siren tones at once to provide extreme “traffic moving” capability (2 speakers required for 200 watt sirens)
Designed with extra large buttons and adequate spacing, which helps reduce accidental button activation
Control panel switches operate up to 12 relay outputs (three 20 amp and nine 10 amp)
Built-in protection against over/under voltage, short circuit and reverse polarity
Hands-free feature allow siren tones to be cycled or canceled by pressing the horn button when the horn-ring circuit is connected