AS AS8302-SPK0022 5-Piece Pack 200W Propagandistic Vehicle Siren Kit with Two Speakers Dual Remotes Microphone 20 Tones for Police Ambulance Fire Traffic Vehicles Can Play Custom-made MP3 Recordings One Pack includes: 1 Siren Box AS830+2 Octangular Speaker SPK002+1 Remote WRC-820/830 +1 Steering Wheel Mounted Remote (All as the main picture shown) It comes with MP3 play function, you can put your wanted MP3 format recordings to your own USB sticker and then plug the USB sticker to the main siren box and play via the siren freely. It contains microphone to speak and has more than 20 warning tones by default to meet most of your needs(like for propaganda vehicle, police car, ambulance car, fire fighting vehicle and some engineering vans,etc.). It is a wireless siren with dual remotes, so you can operate the siren either when you're out of the car or while driving conveniently It's suitable for publicity, police, fire, ambulance, traffic, engineer, volunteer, and private vehicle to use as a PA system or audio warning device.