AS 100W Federal Siren AS7100D 2-Piece Pack 20 Tones 12V with Siren Box Wireless Remote Microphone Fit for Different Vehicles One Pack includes: 1 Siren Box AS7100D+1 Remote WRC-D(All as the main picture showns) +Wiring Accessories+Users Guide It has PA system and more than 20 tones to fit for police, ambulance, fire, volunteer, engineer and other special operation vehicles and occasions. It's a one-channel siren and can work with one matched speaker. It can run two-channel 12V Led lights and with simple one button light control on the remote. The wireless remote control distance is up to 10 meters, it gets rid of the cable limitation and make it more flexible for siren operation.